Catchweight
Pool showdown
The Best Single-Element Cartridge Pool Filters (2026): StarClear vs Clean & Clear vs Jandy CS

Some links here are affiliate links — if you buy through them, we may earn a commission at no extra cost to you (sometimes with a discount for you). It never changes which products we recommend — and we name the SKIPs to prove it.
- contenders compared
- 7
- owner ratings · Amazon
- 1,673
- verified pull-quotes
- 2
- data last verified
- August 2026
One big cartridge instead of four. That is the whole difference between this page and our multi-element roundup, and it decides about a thousand dollars.
But before any of that, here is the thing we found that no other page ranking these filters mentions, and it costs real money.
Hayward sells the same filter twice, $246 apart
Open the Amazon listing for the Hayward StarClear Plus and you get a size dropdown. It looks like a price ladder: pick your square footage, pay accordingly. It is not one.
| What the dropdown offers | Filter area | Price |
|---|---|---|
W3C12002 | 120 sq ft | $853.97 |
W3C1200 | 120 sq ft | $1,099.99 |
C1200 | 120 sq ft | listed |
C17502 | 175 sq ft | $1,699.99 |
Three separate model numbers for one 120 square foot filter, and $246 between the two you can currently buy. Same line, same size, same brand, same page. Nothing on the listing explains the difference, and the cheaper one was the better-stocked of the two when we checked.
Every guide in this category, including the good ones, tells you to buy the biggest filter your budget allows because the only cost of oversizing is money. That advice quietly assumes the price ladder runs the way you expect. Read every line of the dropdown before you add anything to a cart — this is a ten-second check that has nothing to do with brand loyalty or square footage and is worth more than most of the specs people compare.
The short version:
🏆 Best overall: Hayward StarClear Plus 120 — the only single-element filter here a credentialed outlet has actually tested, and the cheap SKU is the one to buy. About $854.
💸 Best value: Pentair Clean & Clear RP 100 — a major brand’s filter at about $575, on a 5.8% complaint rate. Buy the EC- version.
🛁 Spas and very small pools: Hayward StarClear 50 — the cleanest owner record in the entire category, and the one people most often buy for a pool far too big for it. About $429.
📏 Biggest pool: Pentair Clean & Clear 200 — the top of the single-element class before four cartridges start making sense. About $1,059.
⚠️ Dealer only: Jandy CS100 — one of the two lowest complaint rates here, attached to a warranty that excludes buying it online at all.
⛔ Skip: Doheny’s Harris 150 — $329 cheaper than the Pentair at the same size, and its owners describe the housing letting go while priming.
Quick comparison
| Model | Best for | Filter area | Suits | Warranty | Price |
|---|---|---|---|---|---|
| Best overall | 120 sq ft | 1 yr parts, no labor on the W3 online SKU | ~$854typical at AmazonCheck price → | ||
| Best value | 100 sq ft | About 10,000 gallons at the standard sizing rule | 1 yr parts on the EC- SKU; 60 days on the plain SKU bought online | ~$575typical at AmazonCheck price → | |
| Best for spas and very small pools | 50 sq ft | About 5,000 gallons at the standard sizing rule | 1 yr parts, no labor on the W3 online SKU | ~$429typical at AmazonCheck price → | |
| Deepest Pentair base | 150 sq ft | About 15,000 gallons at the standard sizing rule | 1 yr parts on the EC- SKU; 60 days on the plain SKU bought online | ~$829typical at AmazonCheck price → | |
| Biggest single element | 200 sq ft | About 20,000 gallons at the standard sizing rule | 1 yr parts on the EC- SKU; 60 days on the plain SKU bought online | ~$1,059typical at AmazonCheck price → | |
| The one to buy from a dealer, not online | 100 sq ft | About 10,000 gallons at the standard sizing rule | ~$749typical at AmazonCheck price → | ||
| The one to skip | 150 sq ft | Not stated on the listing | ~$500typical at AmazonCheck price → |
Prices move constantly — any Amazon price shown is as of the date noted and subject to change; tap through for today's number.
How we picked, and what almost nobody else does
There is one credentialed outlet covering this category. Bob Vila’s pool-filter roundup carries named authors and states its process: “Testing was conducted on real residential pools, where we evaluated each filter’s performance, ease of installation, and impact on water clarity and pressure.” Their hands-on Best Overall is the Hayward StarClear Plus, and of the models they did not touch they say so plainly — “While we didn’t get hands-on time with these models, they stood out in our research.” That disclosure is why we cite them. Consumer Reports does not rate pool filters at all, and no independent lab tests them.
So the rest of the evidence here is owner records, read the same way on every filter: the star average, what the base is actually made of, and the complete critical-review tail, all seven read signed in on one day in August 2026. That last number is the one that separates this field:
| Filter | Price | Rating | Critical rate |
|---|---|---|---|
| Hayward StarClear 50 | $429 | 4.6★ / 392 | 3.6% |
| Jandy CS100 | $749 | 4.4★ / 40 | 5.0% |
| Pentair Clean & Clear RP 100 | $575 | 4.5★ / 52 | 5.8% |
| Hayward StarClear Plus 120 | $854 | 4.6★ / 954 ⚠️ | 6.9% |
| Pentair Clean & Clear 200 | $1,059 | 4.4★ / 63 | 7.9% |
| Pentair Clean & Clear 150 | $829 | 4.0★ / 91 | 12.1% |
| Doheny’s Harris 150 | $500 | 4.0★ / 81 | 12.3% |
⚠️ That 954 is not what it looks like. It is pooled across five variants from 90 to 175 square feet and $854 to $1,700, so it describes the StarClear Plus line, not the 120. It is still the deepest record in the category and worth having — it just does not mean what a spec-comparison page would tell you it means.
🏆 Best overall: Hayward StarClear Plus 120
The filter with the most independent coverage in the category, at the cheaper of its two identical SKUs.
Its closure is worth understanding because it is unusual: a single knob, no clamp band and no bolts. That is genuinely quicker to open than a clamp ring, and it is why Bob Vila liked servicing it. The honest catch that comes with it is further down.
The best owner review on the whole page is a three-star, from someone who identifies as an engineer working in filtering and pumping. He is warm on the thing you buy it for and unsparing on the thing you do not think about:
Best overall · The single-element filter a credentialed outlet actually tested, at the cheaper of its two identical SKUs
Your pick if you want the filter with the most independent coverage in the category and you are willing to read a size selector carefully enough to save $246 on the identical unit.
“Sparkling clear water and required no filter changes. I live in a dusty desert environment so there is a severe particulate challenge for any filter device. I am enormously happy with the small size. It is tiny compared to the 120 gpm going through it. Now to the problem. The exterior has already deteriorated. It is exposed to sunlight. The surface is discolored, uneven and is chalkish.”
“Right after installation, we noticed a major improvement in water clarity and jet pressure throughout the pool.”
Hands-on tested on a residential pool (Best Overall); rated Installation 4.8/5, Performance 5/5, Maintenance 5/5, Value 5/5. Quote re-verified verbatim on the live page 2026-09-04.
Your pick if you want the filter with the most independent coverage in the category and you are willing to read a size selector carefully enough to save $246 on the identical unit.
“Sparkling clear water and required no filter changes. I live in a dusty desert environment so there is a severe particulate challenge for any filter device. I am enormously happy with the small size. It is tiny compared to the 120 gpm going through it. Now to the problem. The exterior has already deteriorated. It is exposed to sunlight. The surface is discolored, uneven and is chalkish.”— an engineer, 3★, Amazon
Pro review “Right after installation, we noticed a major improvement in water clarity and jet pressure throughout the pool.”Hands-on tested on a residential pool (Best Overall); rated Installation 4.8/5, Performance 5/5, Maintenance 5/5, Value 5/5. Quote re-verified verbatim on the live page 2026-09-04.— Tony Carrick, Paul Rankin & Stephanie Cronk, Bob Vila
- The only single-element filter in this roundup hands-on tested by a credentialed outlet, and Bob Vila's Best Overall
- $246 cheaper than the identical 120 sq ft filter sold under the W3C1200 SKU on the same listing
- Single-knob closure with no clamp band or bolts, which is genuinely quicker to open than a clamp ring
- In stock at the cheap SKU while the expensive one runs to single units
- 6.9% critical rate on the deepest owner record in the category
- Its headline 4.6 stars across 954 is POOLED across five variants from 90 to 175 sq ft — it does not describe this filter alone
- Three separate SKUs exist for this one 120 sq ft size, $246 apart, and nothing on the listing explains why
- Owners report the internal tie rod rusting within two seasons and the exterior chalking in sun within three
- One owner describes the closure threads stripping on a ten-year-old unit and the top leaving the tank hard enough to injure him
- Several owners could not remove the cartridge at all — on a filter class sold on being easy to clean
Arrival damage, a rusting tie rod, and a seized cartridge on a filter sold as easy to clean
66 of the pooled 954 ratings are critical (6.9%), read signed-in 2026-08-26, no Vine. Arrival damage recurs; the tie rod rusts within two seasons on the larger sizes; several owners could not lift the cartridge out at all. One ten-year-old unit's threads stripped and the top left the tank, injuring its owner — service life rather than a defect, and the reason we published a separate guide on filters as pressure vessels. · critical reviews read August 2026
💸 Best value: Pentair Clean & Clear RP 100
About $575 for a major brand’s filter, on a 5.8% complaint rate and 52 owners. For the very common ~10,000 gallon pool this is the sensible buy on this page.
Buy the EC- prefixed SKU. Pentair’s base warranty is sixty days; the eCommerce SKU is the one that gets you a full year. It is the same mechanic we documented in the multi-element roundup, and it works the opposite way round to Hayward’s.
One caution from its own reviews, and it is a fair one to publish about our value pick: an owner had a bleed valve leak, filed a warranty claim, and was denied and redirected to a manufacturer warranty that had already expired. Another asked Pentair directly to confirm whether their seller was authorised — the exact condition the warranty turns on — and never got an answer.
Best value · 100 sq ft for about $575 on a clean 52-owner base and a 5.8% complaint rate
Your pick if you have a pool around 10,000 gallons and want a major brand's filter without paying four figures — and you are buying the EC- prefixed SKU, because the plain one drops your warranty to sixty days.
Your pick if you have a pool around 10,000 gallons and want a major brand's filter without paying four figures — and you are buying the EC- prefixed SKU, because the plain one drops your warranty to sixty days.
- The cheapest filter from a major brand in this roundup, at about $575
- 5.8% critical rate on 52 owners — among the lowest here
- The EC- SKU carries a full year online where the plain TradeGrade SKU gets sixty days
- Sized for the most common in-ground pool volume at the standard rule of thumb
- The listing photograph shows the larger CC150 housing, which one owner calls out as misleading
- One owner had a bleed-valve leak, filed a warranty claim, and was denied and redirected to a manufacturer warranty that had expired ten months earlier
- Another reports asking Pentair to verify authorized-seller status and never receiving an answer — the exact condition the warranty turns on
- 52 ratings is a real but modest base
A misleading listing photo, and a warranty that was denied when it was needed
3 of 52 ratings are critical (5.8%), read signed-in 2026-08-26. Small and specific: the listing image shows the bigger CC150 housing; one owner's bleed valve leaked and the claim was denied and bounced to an already-expired manufacturer warranty; another asked Pentair directly to verify seller authorisation and got no reply. · critical reviews read August 2026
🛁 Spas and very small pools: Hayward StarClear 50 — and the mistake it documents
This filter has the cleanest owner record in the entire cartridge category: 4.6 stars across 392 ratings on one product with no size variants pooled in, zero free-product reviews, and a 3.6% critical rate — the lowest we measured anywhere.
And its complaints are not really about the filter.
Four of the eight readable critical reviews are people who bought 50 square feet for a full-size pool: “Filter is too small for a big pool but I should have asked the local pool store first.” · “The filters clog after 2 days max.” · one owner who replaced a sand filter with it and could not clear dead algae.
That is the single most useful thing this page can tell you. At the standard rule — 100 sq ft per 10,000 gallons minimum, 150 to oversize — this filter suits about 5,000 gallons. A spa, a plunge pool, a very small in-ground. Buy it for that and it is the best-documented filter money can buy in this class. Buy it for a 20,000 gallon pool and you will be hosing a cartridge every other day and blaming Hayward.
Hayward StarClear 50 sq ft Cartridge Filter
Best for spas and very small poolsYour pick if you have a spa, a plunge pool or something genuinely around 5,000 gallons. At that size this is the best-documented filter money can buy; at any larger size it is the wrong product and the reviews prove it.
“Had a sand filter. Replaced with this. Water is crystal clear. BUT filters must be removed and cleaned (no backwash option).”— rc, Amazon
- 4.6 stars across 392 ratings on ONE product with no size variants — the deepest unpooled owner record in the category
- The lowest critical rate we measured anywhere in cartridge filters, at 3.6%
- No free-product reviews anywhere in the base
- Cheapest way into a genuine Hayward closure and warranty
- 50 sq ft suits roughly 5,000 gallons — most in-ground pools need two to four times this
- The dominant complaint is people buying it for a full-size pool and then cleaning it every two days
- A handful report a cracked housing, a deformed gasket on arrival and a dead pressure gauge
- No backwashing means hosing the element, which surprises owners moving from sand
Undersizing — the complaint tail is buyers putting 50 sq ft on a full-size pool
14 of 392 ratings are critical (3.6%), the lowest rate we measured in cartridge filters, read signed-in 2026-08-26 with no Vine. Four of the eight readable cards are sizing mistakes rather than product faults: “filter is too small for a big pool”, “the filters clog after 2 days max”, one owner who replaced a sand filter with it and could not clear dead algae. Genuine faults are few — a cracked housing, a gasket deformed in transit, a dead gauge. · critical reviews read August 2026
Sizing, in one paragraph you can act on
100 square feet per 10,000 gallons is the minimum. 150 per 10,000 is comfortable. Oversizing genuinely is better with filters — the opposite of pumps, where an oversized pump pushes water through the media too fast and filters worse. A bigger filter simply runs longer between cleanings.
Two things the rule of thumb misses. Match the filter’s maximum flow to your pump’s real output, not to the pool’s gallons alone, because the system runs at its slowest link. And the price ladder is not monotonic, as the top of this page shows — so “buy bigger” and “spend more” are not the same instruction here.
Pentair Clean & Clear 150 sq ft Cartridge Filter
Deepest Pentair baseYour pick if you want the most-reviewed single-element Pentair and a pool around 15,000 gallons — and you will open the box the day it lands rather than the weekend before you need it.
- 91 owner ratings is the deepest single-element Pentair base in this roundup
- 150 sq ft covers the most common mid-size in-ground pool with headroom
- The EC- SKU carries a full year online where the plain SKU gets sixty days
- No in-service tank failures anywhere in its complaint tail
- 12.1% of reviews are critical, roughly one in eight, and arrival damage dominates — broken parts, a missing o-ring, a damaged filter insert
- Several owners report the company declining to make a damaged delivery right
- One owner reports Pentair support being an AI bot for the first thirty minutes of the call
- 4.0 stars is the lowest average of the three Pentairs here
It arrives broken, and getting that fixed is the complaint
11 of 91 ratings are critical (12.1%), read signed-in 2026-08-26, no Vine. Nearly all of it is arrival condition rather than service life: arrived broken, a piece broken in the box, a damaged filter insert with the o-ring missing, a PSI gauge failed at five months. Several report the seller or Pentair declining to resolve it, and one describes support being an AI bot for the first half hour. · critical reviews read August 2026
Pentair Clean & Clear 200 sq ft Cartridge Filter
Biggest single elementYour pick if your pool is around 20,000 gallons and you would rather clean one big cartridge than four small ones, accepting that this is the point where a multi-element filter starts making a real case for itself.
- 200 sq ft is the top of the single-element class — beyond this you are into four-cartridge territory
- 4.4 stars across 63 owners, the second-deepest Pentair base here
- 7.9% critical rate, and none of it is in-service tank failure
- One cartridge to pull and hose rather than four
- 7.9% of reviews are critical and arrival damage dominates — a chipped top corner, and one locking ring cracked clean in half in transit
- One owner calls the cartridge's centre pipe flimsy and says it is made to break
- At 200 sq ft and $1,059 a multi-element filter is a genuine alternative worth pricing
- Clogs quickly if the pool runs dirty, which is the trade for one element instead of four
Arrival damage, including a locking ring cracked in half in transit
5 of 63 ratings are critical (7.9%), read signed-in 2026-08-26, no Vine. Arrival damage leads: a chipped top corner, and one locking ring “completely cracked in half” on delivery along with the mounting foot. One owner calls the cartridge's centre pipe flimsy; one reports it clogging quickly. No in-service tank failure in the tail. · critical reviews read August 2026
⚠️ Jandy CS100: the best record here, and you cannot buy it properly online
Two critical reviews in forty. That is a 5.0% rate, among the lowest on this page, and Jandy’s hydraulics have a good reputation.
And Jandy’s warranty does not apply to products purchased through the internet. Not a shorter term — none. There is no online SKU that fixes it, unlike Pentair’s EC- and Hayward’s W3. At $749 for 100 square feet, buying this online means paying above the Pentair equivalent for a filter with no coverage at all.
Take the model number to a dealer. That is the only version of this purchase that makes sense.
Jandy CS100 100 sq ft Cartridge Filter
The one to buy from a dealer, not onlineYour pick if you are buying through a pool professional or a dealer, where the warranty actually exists. Bought online it is a good filter with no coverage at all, and that is a poor trade at this price.
- 5.0% critical rate on 40 owners — one of the two lowest in this roundup
- Only two critical reviews in the entire base
- Jandy's hydraulics are well regarded and the CS line is a straightforward single-cartridge design
- Jandy's warranty does not apply to products purchased through the internet, full stop — there is no online SKU that fixes it
- One owner reports green algae blowing through the collar at the top and bottom of the cartridge, which is water bypassing the element rather than passing through it
- One leak at six months, described as cheap plastic
- $749 for 100 sq ft is above the Pentair equivalent, before you account for having no warranty
Bypass at the cartridge collar, on a very thin complaint tail
2 of 40 ratings are critical (5.0%), read signed-in 2026-08-26 — among the lowest rates here. One describes green algae blowing through the collar at the top and bottom of the cartridge, which is the signature of water going around the element rather than through it. One reports a leak at six months. · critical reviews read August 2026
⛔ Skip: Doheny’s Harris 150
It is $329 under the Pentair at the same 150 square feet, and it is on this page so you can see why that is not a saving.
12.3% of its reviews are critical — the highest rate of any single-element filter we measured. One owner reports the housing blowing apart while the system was being primed, narrowly missing them and their installer. Another reports it cracking and leaking at three years. Two separate owners had the seal leak, replaced it, and had the replacement leak too. One reports pressure climbing past 30 psi and calls the unit unsafe. Several cannot source replacement cartridges for it at all.
None of that is a recall, and we checked — no filter on this page has ever been recalled. It is a pattern in the owner record, and it is the reason the $329 is worth spending.
Doheny's Harris In-Ground Cartridge Filter, 150 sq ft
The one to skipYour pick if nobody we can recommend it to. It is $329 under the Pentair at the same 150 sq ft, and the reason to spend that $329 is in its own owner reviews.
- The cheapest 150 sq ft in-ground filter in this roundup by a wide margin
- 81 owner ratings is a real base, deeper than several majors here
- Sold through Doheny's own store rather than an anonymous marketplace seller
- One owner reports the housing blowing apart while priming the system, narrowly missing them and their installer
- Another reports it leaking and cracking after three years, on a $500 filter
- Two separate owners had the seal leak, replaced it, and had the replacement leak too
- One describes it pushing system pressure past 30 psi and calls it unsafe
- Replacement cartridges for this specific filter are reported as very hard to obtain
- 12.3% critical rate, the highest of any single-element filter we measured
Housing failure, repeated seal leaks, and cartridges you cannot replace
10 of 81 ratings are critical (12.3%), the highest single-element rate we measured, read signed-in 2026-08-26. One owner reports the housing blowing apart while priming and nearly striking them. Another reports cracking and leaking at three years. Two had a seal leak and then had the replacement leak. One reports pressure climbing past 30 psi and calls the unit unsafe. Several cannot source replacement cartridges. · critical reviews read August 2026
The two things that go wrong with every cartridge filter
Bypass. Four of the brands we read have owners reporting that the filter does not actually filter — algae blowing through a collar, debris returning to the pool, “the Dp doesn’t go up even when cartridges are clogged.” That last phrase is the diagnostic, and nobody publishes it: if your pressure differential never rises while the pool stays dirty, water is going around the element rather than through it. A working filter gets progressively harder to push water through as it loads. Flat pressure plus cloudy water means stop cleaning the cartridge and start checking how it seats.
The tank. A cartridge filter is a pressure vessel running at 20 to 30 psi, and trapped air can take the lid off it with enough force to hurt someone — one owner on this very page describes exactly that happening to a ten-year-old StarClear Plus. It is not a cheap-filter problem and it is not a clamp problem: that Hayward has no clamp band at all. It is worth two minutes of your time to know the procedure, which is why we wrote it up separately: your pool filter is a pressure vessel, and here is how not to get hurt by it.
One more trap: the listings that use the real part number as a title
Search any of these model numbers and you will get results titled W3C12002, EC-160317, CX1200AA or CS150 that are not made by Hayward, Pentair or Jandy. The tells, in order of reliability: a preposition — for, fits for, compatible with, replacement for; a misspelt brand (Jndy, Harward), which is deliberate so the listing sits in search results without matching a trademark filter; the OEM part number as the entire product title with no brand byline; and zero or single-digit ratings at a price within $50 of the genuine article.
Some of them cost more than the real filter. Check the byline says the brand, and check the seller.
When to stop buying single-element
At around 200 square feet and $1,059, you are at the top of this class. A four-cartridge filter starts at about 320 square feet, goes most of a season between cleanings, and the cheapest credible one runs about $1,280. If your pool is over roughly 20,000 gallons, or you simply want to touch the thing twice a year instead of monthly, that is the page you want: multi-element cartridge filters, where the model number also decides your warranty.
Not sure cartridge is right at all? Sand vs cartridge vs DE settles the type first.
FAQ
What is a single-element cartridge filter, and how is it different?
It uses one large cartridge inside the tank instead of four clustered ones. That single difference changes the whole product. Single-element filters run from about 50 to 200 square feet and cost roughly $430 to $1,060; multi-element filters start around 320 square feet and run $700 to $2,250. The single element is cheaper to buy, cheaper to re-cartridge, and quicker to service because there is one thing to lift out instead of four. What you give up is time between cleanings: less total area means it loads up sooner. For most pools under about 20,000 gallons a correctly sized single-element filter is the sensible buy, and above that the maths starts favouring four cartridges.
Why does the same Hayward filter show two different prices?
Because Hayward sells the same 120 square foot StarClear Plus under more than one model number, and Amazon shows them in a single size dropdown. As we write this, W3C12002 is $853.97 and W3C1200 is $1,099.99 — identical filter area, identical line, $246 apart, with nothing on the listing explaining the difference. There is a third 120 SKU as well. The practical advice is simple: do not treat the size selector as a price ladder. Open every line of that dropdown and read the number beside each one before you add anything to a cart.
What size cartridge filter do I need?
The standard rule is 100 square feet of filter area per 10,000 gallons as a minimum, and 150 per 10,000 if you want to oversize. Oversizing genuinely is better here, unlike with pumps: a larger filter runs longer between cleanings and puts less strain on everything upstream. So a 15,000 gallon pool wants 150 square feet minimum and is comfortable at 200. One caution the rule of thumb misses: match the filter's maximum flow rate to your pump's real output too, because the system runs at the slowest link.
Is it worth buying the cheapest cartridge filter?
Not on this evidence. We read the complete critical-review record of all seven filters here on the same day, and the cheapest 150 square foot unit has the highest complaint rate of any of them at 12.3 percent, with owners describing the housing coming apart while priming, seals that leaked and then leaked again after replacement, and replacement cartridges they could not source. The Pentair at the same 150 square feet costs $329 more and its complaints are about the box arriving damaged. That $329 buys a different category of problem, and it is the clearest-cut upgrade on this page.
Why do some reviews say the filter does not filter?
That is bypass, and it turned up on four different brands in our reading. Water is finding a way around the element instead of through it — past a collar, a seal or a badly seated cartridge. The tell is diagnostic and nobody publishes it: if the pressure differential never rises while the pool stays dirty, the water is going around. A filter that is genuinely working gets progressively harder to push water through as it loads, and the gauge shows it. If your pressure sits flat at the clean reading for weeks while the water stays cloudy, stop cleaning the cartridge and start checking how it seats.



