How to Close an Above-Ground Pool for Winter (Rigid Wall, Soft-Side, and Florida "Winter Mode")

“Closing an above-ground pool” is two different jobs, and which one you do depends on where you live and what the wall is made of. In freeze country a steel- or resin-wall pool gets cleaned, dosed, lowered and covered for the winter, and an Easy Set or frame pool comes down entirely. In Florida you don’t close at all — you run the pool in winter mode and plan for the two or three nights a year it drops below freezing.

Do the northern procedure in Tampa and you’ve paid to shut down a pool you could have swum in. Skip it in freeze country and you’ll be replacing a skimmer, a pump or a liner in April. So: pick your track first.

Which close do you need?

• Hard-freeze close — if your pool water reliably drops below 60°F for weeks and your air goes below freezing for sustained stretches. Steps 1–4 for the water, then the procedure for your wall type.
• Warm-climate “winter mode” — Florida, the Gulf Coast, coastal Southern California, south Texas. The pool stays open. You reduce, rebalance, and prepare for freeze nights.
• Soft-side pool (Easy Set, metal frame) — the maker decides for you. Intex says it comes down when the temperature drops below 41°F.

Which procedure you follow is set by the wall, not the brand. If you’re not sure which class you own, above-ground pool types sorts the four out.

Florida “winter mode” — the close that isn’t a close

Trouble Free Pool’s own cool-weather guidance opens by acknowledging it plainly: some pool owners live in climates where a pool can be left open throughout the year. That’s most of Florida. Here’s what actually changes.

Your chlorine demand drops — a lot

The sun angle in December is much lower, so it burns off far less chlorine. The amount you need to maintain the water slows dramatically. Keep testing, but expect to add a fraction of what you added in July. Don’t “keep the schedule” out of habit and overshoot — test first, then dose.

Your salt cell is going to quit, and that’s normal

This is the single most common winter panic call in Florida, and it isn’t a broken cell. Salt chlorine generators stop producing in cold water on purpose, to protect the cell:

• Pentair IntelliChlor: turns off at 52°F, ±3°F and will not produce chlorine.
• Hayward Aqua Rite: automatically stops generating below 50°F.

Both are documented in the manuals. Hayward notes this is usually not a problem because bacteria and algae stop growing at that temperature. When your cell goes quiet, switch to liquid chlorine for the duration — it’s the cheap, clean way to hold FC through a cold snap. (More on cell behavior and lifespan in how long does a salt cell last.)

Cut pump run time, don’t cut it out

With cold water and low chlorine demand, you can minimize pump run time and run only enough to keep the chemicals mixed. That’s a real saving — and it’s the same logic as why 24/7 pumping is a myth in summer, just further along the curve.

The freeze night plan — this is the part that matters

Florida gets a handful of nights a year in the 20s and low 30s. That’s when pools get hurt, and it’s entirely preventable:

1. Run the pump. Moving water is difficult to freeze, so circulate as much as possible. Pentair’s pump manuals say the same thing in their own words: in mild climate areas, when temporary freezing conditions may occur, run your filtering equipment all night to prevent freezing.
2. Set the valves so every pipe gets flow. Figure out a valve setting that makes at least a bit of water pass through each pipe and each piece of equipment. A dead leg is where the split happens.
3. Don’t trust the pump’s built-in “freeze” feature to protect the pool. Variable-speed pumps have a cold-weather mode — Pentair’s Thermal Mode defaults to a 40°F set point at 20% speed — but Pentair explicitly says not to rely on it, because it reads the internal drive temperature, not the air. Hayward is even blunter: its Low Temp Operation “is NOT intended to protect the pump, system plumbing, or pool from freezing.” These features protect the pump’s electronics, not your plumbing. If you’re unsure whether your freeze protection is working, turn it off and set the system to run 24/7 manually until the freeze passes.
4. Have a power-outage plan. Freeze nights and outages travel together. Know how to drain your equipment quickly — find the drain plugs on your pump pot and filter before you need them in the dark. Your hoses and pump sit fully exposed above the ground, so wrap them, tarp the equipment, keep a couple of cut-up pool noodles or a half-full plastic jug to drop in the skimmer.

That’s Florida winter for an above-ground pool: no cover, no take-down — just less chlorine, less pump, and a plan for three cold nights. A soft-side pool is the exception if your nights reach 41°F; see the soft-side section below.

Hard-freeze close — the water (steps 1–4)

Steps 1–4 are the water: they are the same whatever holds the water in, and they are what decides whether you open to clear water in spring. Then the wall type takes over.

1. Wait for the water to drop below 60°F

Not the air — the water, and solidly below. Below 60°F algae is fairly unlikely to grow, and when it does, it grows very slowly. Closing early is the number-one cause of a green opening, because you’ve sealed a pool that can still grow algae into a dark box for five months. Also don’t cut it so fine that the equipment has no time to drain and dry before the first hard freeze.

While you wait, let the water level drift down toward the bottom of the skimmer instead of topping it off. It saves you draining time later.

2. Balance the water

Bring pH to 7.6-7.8 and make sure TA and CH are in their recommended ranges — the 5 numbers covers what “in range” means. Don’t add acid to push pH lower just because you’re closing.

You’ll see 7.4-7.6 in a lot of closing checklists. On a vinyl liner there is no reason to push it down there, and a Trouble Free Pool expert told a vinyl salt-pool owner asking about closing at 7.8: “That’s fine. Your pH will rise while your pool is closed.” Trouble Free Pool’s reasoning elsewhere points higher:

• The pH you close at won’t stay put. In a closed pool, pH drifts up until it settles against your alkalinity. Trouble Free Pool’s wiki says it often passes 8.2, and that “the CSI when a pool is closed makes little difference with scaling or etching as pH and water temperature will change while the pool is closed.” Lower alkalinity is what keeps that ceiling down, not a lower starting pH.

A vinyl liner cannot etch, so the closing-checklist advice to push pH up to protect the surface does not apply here. Close in the normal range and let it drift.

3. SLAM two or three days before, then let FC drift down

Two or three days ahead, raise chlorine to SLAM level for your CYA and hold it until FC holds overnight (which it usually does on the first night). Then let FC fall to 20% of your CYA — typically another day and a half. You’re closing with the water proven algae-free and chlorine at the low end of normal, not at shock level.

4. PolyQuat, then clean

Add the startup (maximum) dose of PolyQuat per the package. Then clean up leaves and dirt in the water. Don’t chase every leaf that falls in while you’re finishing — that’s what the cover is for. (Note what’s not on this list: a “winterizing kit” of mystery chemicals. See is the pool store a scam.)

“Per the package” is doing real work in that sentence. We compared four products all sold as PolyQuat 60 or “Algaecide 60,” all nominally the same chemistry, and their stated startup doses span 4 oz to 16 oz per 10,000 gallons — a 4× range. One brand’s weekly maintenance dose is another brand’s startup dose. “Algaecide 60” is a name, not a spec. Dose the bottle in your hand.

And the thing to know before you buy: the cheapest algaecide on the shelf is usually the most expensive one to use. One of the best-selling algaecides in this category is 6% polyquat, not 60% — its own back label calls for 97 to 128 oz per 10,000 gallons, so a 128 oz jug is roughly a single closing dose. It sits on the shelf at about half the price of a real PolyQuat 60 quart and costs more per dose than either pick below.

Pull ladders, handrails, toys, and anything removable and store it. Ladders can fight you — release every clamp and lock, then wiggle with a helper.

Which procedure you follow is set by the wall, not the brand. A rigid steel or resin wall stays up and gets winterised; an Easy Set or metal-frame pool is drained and stored, and Intex is explicit that it must come down below 41°F. If you’re not sure which class you own — or you’re still shopping — above-ground pool types sorts the four out.

On an above-ground pool the walls are the thing you’re protecting, the plumbing is external and comes off, and one whole category — soft-side pools — gets taken down entirely.

Rigid-wall pools: water level, equipment and cover

With the water clean and dosed (steps 1–4 above), the rest of a rigid-wall close is the water level, the equipment and the cover.

Water level. Drain to about 6 inches below the lowest return or skimmer opening, and remove the hoses and fittings. Hayward’s own skimmer instructions for the Dyna-Skim line say the same six inches and add the part that explains why: be sure the skimmer is kept free of water accumulation, because warranty does not cover damage caused by ice forming in the skimmer.

Every source gives you a different number, and most of them are not actually disagreeing. Eight makers publish eight winter water levels, from “leave it alone” to eighteen inches down, and it reads like a category that cannot make up its mind. It mostly can. Two things are going on, and once you separate them the field almost closes.

First, they are measured from different places. GLI puts it in a single sentence: the water goes “below the skimmer and return lines (approximately 18 inches down from the coping).” GLI is equating those two, not offering a choice between them. So “18 inches below the coping,” “6 inches below the lowest return,” and one pool maker’s “about one foot below the skimmer intake” can all be the same water line on the same pool, described from three different starting points. Read the datum before you read the number — a figure measured from the coping and a figure measured from the skimmer are not comparable, and nothing in these documents flags that they have switched reference points on you.

Second, they are answering different questions. Sorted by what each number is for:

Robelle and Blue Wave are not in conflict — together they describe a window, roughly six to twelve inches below the top rail.

And here is the gap that actually matters: nobody publishes the conversion. Skimmer makers measure from the skimmer — Hayward’s Dyna-Skim sheet says “Drain pool level approximately six inches (6″) below skimmer opening,” Swimline’s says two to four inches below its own. Cover makers measure from the deck or the top rail — Blue Wave’s twelve. No maker in either group publishes how far below the top rail the skimmer opening sits. We went looking specifically for it: that offset exists only inside each pool maker’s factory wall-panel drawing, as a diagram rather than a number, and it changes with wall height. Which means you cannot work out from published documents whether your skimmer target lands inside your cover’s window. You have to measure your own pool — top rail down to the bottom of the skimmer opening, plus the drawdown your skimmer manual asks for, against the maximum drop your cover manual allows. It takes a tape measure, and it is the only honest way to know. If the sum comes out past your cover’s maximum, that is rule 3 below, and it is telling you to buy a bigger cover.

The two genuine outliers are outliers on purpose. EZ Drain says “you must maintain normal water height in your pool during the winter”; Intex says “Leave the clean water in the pool.” Neither is careless. EZ Drain’s cover has a drain panel and the water is what holds it up, and an Intex pool has no skimmer cut into a steel wall to protect. Both removed the constraint everyone else is solving for, which is why their answer is different. No maker in the set warns against leaving the water high — that instruction does not exist anywhere we could find.

So the rule is a rule, not a number:

1. Fit a skimmer cover plate or a Gizzmo and most of the reason to drop goes away. Robelle’s current sheet offers exactly this alternative: plate the skimmer and leave the water at its normal level — which is what the cover wants anyway.
2. No plate: drop below the skimmer and the returns. That is your target, and it is the only number here protecting a part that carries a written warranty exclusion.
3. Do not go past your cover’s stated maximum drop. If protecting the skimmer needs more drop than the cover allows, that is the signal to buy a bigger cover — not to split the difference and hope.
4. Your cover’s manual wins on the ceiling; your skimmer’s manual wins on the target. They are answering different questions, and neither one overrules the other.

Plugs are your call. This is where a lot of confident internet advice is simply wrong. Trouble Free Pool’s above-ground procedure says it directly: skimmer and return plugs or “gizmos” may be installed or they may be left open — this is a personal choice for each pool owner. What isn’t optional is getting the water out of the skimmer.

Equipment. Drain the pump and filter well and remove the pump, hoses, and fittings. On a multiport, remove the spider gasket — leaving it compressed all winter is what flattens it. Smaller fittings, hardware, and filter drain plugs can live inside the pump pot basket; lube the pot with silicone lube. Store the pump, smaller filter systems, and the spider gasket indoors. For a large sand filter that stays outside, secure a heavy trash bag or tarp over it against debris, snow, ice, and water.

One buying note, because it trips people up in both directions: several of the best-selling “pool lube” products are synthetic, ceramic or PTFE formulas rather than silicone, and PTFE is the one to skip — it gums up and gets sticky. Buy something that says silicone on the label.

Cover, and what the pillow actually does. Which cover you buy is its own decision — above-ground winter covers and air pillows sorts it by wall, shape and solid-or-mesh, and the best above-ground pool covers ranks them by scrim count, the one spec that actually predicts whether a cover survives the winter. Once it’s on: the cover should touch the water and be supported by air pillows or by water. The pillow’s documented job is preventing the cover from sagging into the gap between the top of the pool and the lowered water line — that’s it. The other claim — that the pillow absorbs ice expansion and saves your walls — is printed by manufacturers: Blue Wave heads a bullet “Ice Equalization,” Swimline calls its pillows “ice compensators,” and POOLHACKER tells you to inflate to 50–70% “so, as freezing progresses, the impact of expansion goes to squeezing” the pillow. What nobody independent has shown is that it measurably works, and there is a practical hole under the theory: a pillow that deflated in January cushions nothing either way. Buy one to hold the cover up; if it also helps with ice, that is a bonus you cannot count on. Also plan for the pillow to fail: air pillows often don’t stay inflated for the season and are found deflated at opening. A more durable swap is a car or truck inner tube — the heavy rubber holds air far better than thin vinyl, so it’s still holding the cover up at spring opening. And the other thing everyone says about covers and walls is not in any manual either. It is widely repeated that a winter cover can pull an above-ground pool’s walls inward. We went through the installation sheets of fifteen cover and pool makers — Blue Wave, Aqua EZ, GLI, Robelle, Pool Mate, Winter Block, Doheny’s, EZ Drain, Gre, Intex, Swimline and Leslie’s among them — and not one prints it. What they print is that the load lands on the cover, not the wall: Blue Wave’s own guide says the cover should hug the sidewall and lay on top of the water, and that stretching the cover will damage the cover; Leslie’s says a stretched, “tented” cover is damaged when rain or snow accumulates on it. The one genuine collapse warning we found comes from the pool maker rather than the cover maker, and the mechanism is weight, not tension: if the pool loses water under a loaded cover, release the cover — the weight left sitting on the pool can cause it to collapse.

Cable tight, fabric slack — those are two different instructions, and mixing them up is where people go wrong. Blue Wave’s guide carries both on facing pages: pull the cable until it has “no slack around the pool’s edge,” and let the cover itself “rest on the water.” Winter Block says the fabric half plainest: “Do NOT pull the cover tightly, allow it to hang around the center pillow.” Be aware this is not unanimous — Robelle and GLI never print the fabric half at all, and Robelle leans the other way, warning that a cover installed less than snugly will billow in wind and tear. Two pool makers want the cover pressing the pillow down into the water. Where a pool maker and a cover maker disagree about the cover, follow the cover maker: it is their warranty.

Pillow placement, pillow fill, and cover tension

Under the cover. The pillow floats on the water and holds the cover up out of the gap.

Not on top of it. Up there it holds nothing up, and the first wind takes it.

Half to two-thirds full. Soft enough to squeeze. This is the instruction everyone skips.

Never filled tight. An over-inflated pillow is a drum, and a drum splits.

Cable snug, fabric loose. The cover hugs the wall and lies down on the water, which is what carries its weight.

Not stretched across the top. Held off the water, it carries the rain and snow itself — which is what tears it.

Putting the pillow in, in order. The sheet that comes in the box with a pillow is usually a few cartoon steps, so here is one pillow maker’s printed instructions redrawn and checked against the cover makers above. The step that matters most is the last one, and it is the same rule as the cover: loose fabric, resting on the water.

Installing an air pillow, step by step

1. 1

   Fill it half to two-thirds — never full. Use a blower or pump at the valve and stop while the pillow still gives when you press it. A full pillow is the one that splits.

2. 2

   Seal the valve, and point it up. Smear a little silicone lube around the valve (one that says 100% silicone on the label), then put duct tape over it. In the pool, the valve faces the cover, not the water.

3. 3

   Rope through the corner grommets. Tie a line to each reinforced grommet before the pillow goes in the water — it is far easier on the deck than reaching from the rail.

4. 4

   Float it in the middle and tie it off. Run the ropes to the top rail or the uprights on opposite sides, so the pillow cannot drift to the wall. On an oval, space more than one along the long side.

5. 5

   Right: Cover on, loose enough to drape. It should hang over the pillow and lie down on the water around it.

6. 5

   Wrong: Not stretched into a dome. Pulled tight over the pillow, the cover never reaches the water, so it carries the rain and snow on its own — the load that tears covers.

Holding the edge down: four different failures, and they do not share a fix. Everything above gets the cover ON. What owners fight all winter is the edge — and “my cover blew off” is really four separate problems that want four separate answers. Sorting them is most of the battle, because the accessory that fixes one does nothing for another.

The cover maker’s answer is cable, winch, and water on the cover — that is the entire list. Blue Wave’s above-ground procedure is five steps, and the wind instruction is step 2: “Your cover is made to have rainwater accumulate on top of it all winter. This water will not damage your cover in any way. Do not pump off the cover during the Fall. Water on top of the cover will hold it in place and protect your cover from wind damage.” Aqua EZ’s sheet is the same shape — cable, winch, ratchet, and no mention of clips or wrap anywhere. But it is not a universal answer, and the owner who says so is worth quoting, because he is on Long Island and had tried everything: “2+ inches of water on the pool cover never worked for me. The wind lifted the entire cover along with all the water.”

And the same maker’s warranty cuts against the accessories aisle. Blue Wave’s twelve-year cover warranty, clause 5: “Improper installation will render this warranty null and void. Improper installation includes the use of milk jugs, concrete blocks or other hold down devices not included with the cover.” Only a cable and a winch come in the box. Blue Wave also sells the wrap — the Gladon Winter Cover Seal lists under the Blue Wave store. We could not find Blue Wave reconciling those two, and we are not going to tell you a claim has ever been denied over a clip, because we could not find that either. Read clause 5 before you spend on hardware — and note that clause 6 excludes “damage from the elements such as wind, snow, heavy rains” regardless, and names the top rail as a wear point you are required to pad.

The wrap: the popular answer, and its own buyers say it does not stop wind

Stretch-wrapping the top of the pool — a giant roll of clingy plastic film, wound around the rail and down the wall over the cover’s skirt — is the fix the forums reach for first. It is cheap, it is easy, and the evidence against it is unusually clear, because the category’s best-known product has the deepest owner base and the lowest score in it. We card it as a SKIP in the above-ground cover roundup.

Gladon’s Winter Cover Seal reads 3.9★ across 1,542 ratings, and 199 of those reviews are critical (read 2026-09-15). Reading them, the complaint is not quality. It is that the product does not do the one thing the box promises — “Prevents wind from getting under and damaging your winter cover” — and the owners saying so tell you exactly where they live:

• “We live in the country in flat land with not many trees so we have more wind at our house than a lot of people who have wind breaks nearby. If you have other buildings or wind breaks around you this might work.”
• “We get crazy North wind in our backyard because we are off a golf course and there aren’t trees for wind break. It stretches great, sticks great, but it did NOTHING about the wind.”
• “Wind will deflect right up the plastic on up under the cover.”

The advice everyone gives is “wrap it deeper,” and two owners refute it separately. One in the Midwest did exactly what the internet tells you to: “Don’t recommend for any windy parts of the country. I’m in the Midwest. It lasted 2 weeks. We stretched it around the pool several times. It was very tight and we went further down the walls of the pool than pictures.” One off a golf course went the whole way: “We even wrapped the really windy side all the way down to the ground and the cover is still flapping like a flag.” Deeper, tighter, to the ground — and a fortnight.

They also name the mechanism, and it is the uprights again. “It seemed to funnel it right up between the side supports,” says the second owner; a third explains the geometry that causes it — “any pool with thick vertical supports makes the wrap to far away from the pool wall.” That is the same failure the TFP Guide described above, arriving from three unrelated directions: a continuous band seals the straight runs and cannot seal at a post. So wrap deeper if you wrap, by all means. Just do not buy depth expecting it to convert the product into a wind fix.

Two things the wrap genuinely gives you, both worth the $13 to $17 on a sheltered lot: it seals the gap against leaves and blown debris, which is a real spring-cleanup saving; and it stops the creep failure in the table above. Owners who like it are consistently the ones with a wind break.

If you do wrap, two buying notes and one technique the box omits. First, this is PE stretch film — one pool-branded listing says so itself, describing the identical product as “suitable for logistics, take-out packing” — so buy on width and length, not on the pool photo. Gladon’s own sizing line is the useful datum: “One box will wrap around a 24 ft pool 6 times.” Six turns around a 24 ft round pool is about 450 feet, so a 500 ft roll does one average pool and a 1,000 ft roll gets you down the wall or through two seasons. Generic pallet wrap is cheaper per foot and sold in four-roll cases, which for one pool is more plastic than you will ever use. Second, the technique, which an owner had to work out because the instructions do not say it: “No instructions to tell you that you need to start it below the top rim which I started on top as I came around second time it fell right off so than I started on bottom and went up it seemed to work.” Start below the rim and wrap upward.

What the wind-under problem actually responds to

Fit. That is the finding, and it comes from two owners who fixed the same problem by moving in opposite directions, which is what makes it credible.

• Long Island, 45 mph gusts. After years of clips, bags and jugs, he bought a smaller cover — a 3 ft overlap instead of 4 ft: “The smaller cover fit tightly all around (7 inch top rails) which prevented any flapping.” He kept the water level high with a skimmer plug, ran 4 ft and 8 ft water tubes around the entire inside perimeter tied to the winch cable, used no air pillow and left no standing water. “The wind gusts were as high as 45 mph, and not once did the wind made it underneath the cover!”
• Buffalo, NY. He went one size bigger — a 28 ft cover on a 24 ft pool — with the steel cable and six gallon jugs: “I make sure to tie them through both the grommet and cable… Never had it blow completely off since going bigger.”

Opposite purchases, one variable: a skirt that lies flat against the wall instead of flapping. Too much loose skirt is sail area; too little never reaches the cable line. Which direction you go depends on your top rail width, and neither owner is wrong.

The gap itself is at the rail, and it is small. The original question on the Long Island thread is the best diagnosis anyone has written of this failure: “the wind must be getting in underneath where the top rail meets the top of the pool sidewall. So unless this space is filled, wind will always make its way in.” A TFP Guide’s reply is the part that kills the perimeter-band theory: “Problem is that the uprights will create the gaps regardless.” A band — wrap, strap, or tape — cannot seal a gap at an upright, which is why none of them close this failure. Owners who attack the gap directly report cutting pool noodles lengthwise and pushing them between the top rail and the wall. And on a genuinely exposed site the most-repeated advice from experienced posters is not a product at all: put up a wind break, “much like a snow fence,” because you are not going to out-clamp 50 mph.

One more method that works and gets no shelf space: a continuous ratchet strap. A Central Wisconsin owner loops 3 in. tow straps end to end into one continuous band and tensions it with a web ratchet — with his own caution attached, “Do not get it crazy tight. Do not want to tip the pool walls in.” Worth knowing that no cover or pool maker in our fifteen-document sweep prints that wall-pull warning; it is owner practice, and the documented risk in the manuals is to the cover, not the wall.

What clips are actually for

Not wind. Creep, and installation — and on both jobs they earn their money.

The clearest statement of the limit comes from the Long Island owner above, after several seasons of running the full kit: “The practices that I’ve used so far (clips, water bags, jugs, etc) has merely prevented the cover from blowing entirely off the pool - they have done nothing to prevent the wind from getting under the cover in the first place.” Clips hold a cover that is already sitting tight. They cannot re-seat one that is already ballooning. That single distinction explains why owner reports on clips split so violently: sheltered lot, they work; open field, they pop off, and both owners are telling the truth.

The undersold use is the install. A TFP Expert on a 2025 thread: “The clips are also essential! I clip the parts i dont want slipping as i pull (like the bottom side of the taco) & as i pull i add more clips. I just clip em to my shirt before i start for easy access. I also use them for removal assistance.” A bag of clips that turns a two-person cover wrestle into a one-person job is worth it on that basis alone, before any wind claim.

And when a clip breaks, the system worked. Clips go brittle after a season or two and owners lose some in a blow — that shows up plainly in the owner record. Set it against what else is in that load path: a clip that costs about a dollar, a cover with a wind exclusion in its warranty, and a top rail. If something has to give, the clip is the cheapest thing on the list and the only one you can replace from a bag in the garage.

Hardware-store spring clamps are a real alternative, and jaw capacity is the spec — not grip strength. The endorsement is genuine and it is specific: a Long Island owner runs 2-inch spring clamps from the hardware store, and reports “they are like $1 each. I use 10 for my 15 foot above ground pool. Works great.” Before you copy it, two things. A steel spring-clamp set opens about 3/4 in. to 1 in.; the nylon sets open 1-3/8 in. to 2-1/4 in. A cover folded over a top rail is thicker than an inch, so the metal set is stronger on something it cannot reach — buy the mixed-size nylon set, which is the only one with a jaw that spans a rail, and ignore the single-size pack. And nobody has tested the durability either way. We went looking specifically for owner reports of steel clamps rusting through a winter or nylon going brittle in the cold, and found none in either direction, so we are not going to tell you which lasts. What we can tell you is the exposure rule from every other product on this page: the owners it works for have small pools and wind breaks.

Leaf net. A leaf net over the winter cover is a good move while leaves are still dropping — but remove the net and the debris it caught before hard freeze. A frozen-in leaf net is a spring problem.

Ice shelf. Once it forms, don’t break it. Vinyl tears.

The take-down option. You can also drain and clean the pool and store the liner and frame in a dry place. One warning from people who’ve done it: liners stored outdoors or in a shed have been found with small holes where rodents chewed through the vinyl. Store it somewhere sealed.

Soft-side pools (Intex, Bestway and similar)

Completely different rules, and the manufacturer is unambiguous. Intex’s Easy Set manual: you must drain, disassemble and properly store the pool when the temperature drops below 41°F (5°C) — ice damage can result in sudden liner failure or pool collapse. That is a hard instruction, not a suggestion, and it does not transfer to steel-wall pools.

If your winter never gets to 41°F and you choose to leave it up, Intex’s own leave-up procedure is: clean the water thoroughly, remove the skimmer, plug the inlet and outlet fittings from inside the pool, remove the ladder, remove the hoses connecting pump and filter, add the appropriate chemicals, clean and drain the pump/filter housing/hoses, discard the old filter cartridge (keep a spare for next season), and bring the pump and filter parts indoors to a dry place between 32°F and 104°F.

Bestway’s sand filters get winterized on their own terms too: drain the tank, pour the sand out completely, dry all components, and store the unit in a dry place out of reach of children.

The mistakes that cost the most

• Closing while the water is still warm. Cheapest mistake to avoid, most expensive to fix — you’re locking algae in the dark with a food supply.
• Leaving water in the skimmer. Hayward’s warranty does not cover ice damage in the skimmer. Get the water below it, or plate it.
• Dropping the water past what your cover can span. Your cover manual sets the maximum; if the skimmer needs more drop than that, the answer is a bigger cover.
• Pulling the cover fabric tight. The cable goes tight, the fabric rests on the water. A stretched cover is a damaged cover.
• Pumping the rainwater off the cover in the fall. Blue Wave: the water on top is what holds the cover down.
• Leaving the pump, the cartridge or the spider gasket outside. All cheap parts, all freeze-crack or flatten for no reason.
• Counting on the air pillow to protect the walls from ice. It’s cover support. Plan around it deflating.
• Leaving a soft-side pool up below 41°F. Intex is explicit: ice can cause sudden liner failure or collapse.

Bottom line: figure out which winter and which wall you have. Freeze country, rigid wall: wait for 60°F, balance, SLAM and drift, PolyQuat, get the water out of the skimmer without dropping past your cover’s limit, bring the pump and hoses in, and cover it with the cable tight and the fabric slack. Soft-side: take it down below 41°F. Florida: don’t close — dose less, run less, and run the pump straight through the freeze nights. Either way, when it’s time to reverse it, how to open an above-ground pool picks up where this leaves off.