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The Best Pentair IntelliChlor IC40 Replacement Cell (2026): Aftermarket vs OEM
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- July 2026
Your Pentair IntelliChlor IC40 cell has stopped making chlorine, you’ve priced a genuine replacement, and the number stopped you cold: around $1,500 for the OEM cell — and that’s if you can even find the old IC40, which Pentair has discontinued. Here’s what the pool store won’t lead with: the cell is a bolt-on consumable, and you don’t have to buy it from Pentair. A good aftermarket cell drops into the same IC40 power center in about fifteen minutes and costs hundreds less. This guide names the aftermarket cell worth buying, the one case where the OEM is still the right call, and the cheap cells to avoid — because “aftermarket” covers both a genuinely good deal and a two-season throwaway, and telling them apart is the whole game.
The short version:
🏆 Best value — EverCrystal IC40 cell — the aftermarket cell we’d actually buy. It’s a true drop-in for the IC40 (up to 40,000 gallons), adds its own onboard temp/salinity sensor so it doesn’t lean on an aging power center, and runs about $940 — roughly $560 less than the OEM. It’s the most-proven aftermarket option here at 4.5★ / 27 Amazon ratings. Two honest catches: a 12-month warranty (shorter than OEM), and no automation link.
⚙️ Buy the OEM only for automation — Pentair IntelliChlor Plus40 — the current genuine cell (part 523735) that replaces the discontinued IC40. The one real reason to pay around $1,500 for it: it’s the only cell that speaks to Pentair IntelliCenter/EasyTouch automation over RS-485. If your pad is automated, this is your cell; if it isn’t, you’re paying a premium for a data link you’ll never use.
⚠️ Skip the sub-$700 no-names — the swarm of generic IC40 cells that undercut everything on price and hide the catch: a 1-year warranty, smaller plates or a 3,000–5,000-hour life (versus the 8,000–10,000 you want), and thin or padded ratings. A cell is a recurring cost — a cheap one that dies in two seasons is the expensive choice.
Which cell size do you need?
Pentair’s IntelliChlor comes in three sizes, and your replacement has to match the unit you own — the number on the cell is the pool size it’s rated for. Both aftermarket brands worth naming (EverCrystal and APX) make all three; this guide’s pick is the 40,000-gallon IC40 size.
| Your Pentair unit | Rated pool size | Aftermarket cell | OEM cell |
|---|---|---|---|
| IntelliChlor IC20 | up to 20,000 gal | EverCrystal 20k · APX P20 | Pentair Plus-line |
| IntelliChlor IC40 | up to 40,000 gal | EverCrystal 40k (our pick) · APX P40 | Pentair Plus40 (523735) |
| IntelliChlor IC60 | up to 60,000 gal | EverCrystal 60k · APX P60 | Pentair Plus-line |
Aftermarket vs OEM, head to head
| Model | Best for | Fits | Max pool size | Controller | Automation | Warranty | Price |
|---|---|---|---|---|---|---|---|
| Best value — the aftermarket IC40 cell you can actually buy | Pentair IntelliChlor IC40 (520555) | 40,000 gal | Onboard temp/salinity sensor + flow switch | No (no RS-485) | 12-month | Check price → | |
| Best for a Pentair automation pad | Pentair IC40 → Plus40 (523735) | 40,000 gal | Integrated LED (salt %, output, cell life) | Yes (IntelliCenter/EasyTouch) | 3-yr (dealer-installed) | Check price → |
Prices move constantly — tap through for today's number.
The column that decides it is Automation. Every one of these cells makes chlorine the same way and drops into the same IC40 power center — so for a pool without automation, paying roughly $560 extra for the OEM buys you a longer warranty and a data link you’ll never connect. That’s the honest case for aftermarket: on an un-automated pad, the genuine cell’s main advantage is inert. Flip it around and the OEM earns its price the moment you run IntelliCenter or EasyTouch, because an aftermarket cell has no RS-485 connection and your automation simply won’t see it. The other honest column is Warranty: the aftermarket saving comes partly out of coverage (12 months versus 3 years), so buy aftermarket with the expectation that you’re trading warranty length for a lower price. There’s no independent lab that bench-tests aftermarket salt cells, so we lean on the one signal that’s real and buyable — owner ratings on the exact cell — and note where a maker doesn’t publish a rated cell life, because that omission is itself the tell.
Best value: the EverCrystal IC40 cell
Best value — the aftermarket IC40 cell you can actually buy · The aftermarket replacement cell for a Pentair IntelliChlor IC40 — a genuine drop-in with an upgraded flow switch and onboard temp/salinity sensor, for roughly $560 less than Pentair's OEM cell (about $940 vs around $1,500), for pools up to 40,000 gallons. Two honest catches: no automation (RS-485) integration, and a 12-month warranty.
Your pick if your Pentair IC40 cell died, you don't run pool automation, and you'd rather spend about $940 than roughly $1,500 on the OEM cell — a 4.5★ drop-in with its own onboard salinity sensor.
Check price at Amazon →“Literally half the cost of a Pentair replacement. After using it so far, no issues at all. Chlorine levels are consistent.”
EverCrystal Replacement Salt Cell for Pentair IntelliChlor IC40 (40,000 gal)
Best value — the aftermarket IC40 cell you can actually buyYour pick if your Pentair IC40 cell died, you don't run pool automation, and you'd rather spend about $940 than roughly $1,500 on the OEM cell — a 4.5★ drop-in with its own onboard salinity sensor.
“Literally half the cost of a Pentair replacement. After using it so far, no issues at all. Chlorine levels are consistent.”— Jackie L, Amazon
- A true drop-in for the Pentair IC40 — same length and union threads, so it swaps in about 15 minutes with no plumbing changes and no special tools
- Onboard temp/salinity sensor and an upgraded flow switch — it reads your salt level itself, so it works even if your OEM power center is also aging
- Roughly $560 less than Pentair's OEM replacement cell (about $940 vs around $1,500) — the whole reason to go aftermarket on an IC40
- 4.5★ across 27 Amazon ratings — an independent, buyable track record, unlike the no-name generics
- No RS-485 / data connection, so it will NOT integrate with automation — Pentair IntelliCenter/EasyTouch, Jandy AquaLink, or Hayward controls won't see it or drive it. If you run automation, buy the OEM Plus40.
- 12-month warranty — shorter than the OEM's 3-year (and the specialty-retailer APX P40's 2-year); you're trading warranty length for the lower price
- Doesn't publish a rated cell-life in hours or a chlorine-output figure — the OEM quotes ~10,000 hr / 1.4 lb/day; size to your gallons and don't assume
This is the aftermarket cell we’d put on our own IC40. It’s a genuine drop-in — same length, same union threads — so the swap is a fifteen-minute job with no plumbing changes: kill the power, unscrew the old cell, unplug the cord, thread in the EverCrystal hand-tight, plug it back in, power up. What sets it above the generic pack is its own onboard temp/salinity sensor and upgraded flow switch: it reads your salt level itself, which matters because on an older IC40 the power center is often aging right alongside the cell. At about $940 it’s roughly $560 under the OEM cell — the whole reason to go aftermarket — and it’s the most-proven option we found, at 4.5 stars across 27 Amazon ratings (an early but real owner base, well clear of the no-name cells’ thin scores). It comes in the same three sizes as the OEM (20k / 40k / 60k), so IC20 and IC60 owners get the same deal.
Not for you if: you run your pool on Pentair automation, or you want the longest possible warranty. The EverCrystal has no RS-485 data link, so IntelliCenter/EasyTouch (or a Jandy/Hayward controller) won’t see or drive it — buy the OEM Plus40 for that. And its warranty is 12 months, shorter than the OEM’s three years; if you’ll buy from a specialty pool retailer rather than Amazon, the APX Performance P40 is a similar-priced aftermarket cell with a 2-year warranty worth comparing. It also doesn’t publish a rated cell life in hours, so size it to your pool and don’t over-run it.
Buy the OEM only for automation: Pentair IntelliChlor Plus40
Pentair IntelliChlor Plus40 Salt Chlorine Generator (523735)
Best for a Pentair automation padYour pick if your pad is already Pentair and you want the tightest automation integration — the current Plus40 cell (~$1,749). Its cell is the priciest here to feed, and its 3.6★ is the early-2025 firmware batch, fixed on current stock.
“It has worked perfectly with no issues. Very happy with the control panel and how it shows the pool temp and other info.”— Shannon, Amazon
- The current IntelliChlor Plus40 (part 523735) — a drop-in for the now-discontinued IC40, so you're buying the live generation, not old stock
- Integrates natively with Pentair IntelliCenter/EasyTouch automation — the cleanest choice if your pad is already Pentair
- Highest-quality reputation among pros (Swimming Pool Steve names Pentair the top SWG brand) with a nationwide dealer and parts network
- Self-cleaning cell with a clear LED readout of salt level, output %, and cell life
- Its early-2025 batch had a firmware bug (Pentair bulletin A00709) that threw false CHECK CELL / SYS OFF alerts and tanked the early Amazon reviews — but it only affected units made before Oct 20, 2025 (firmware 1.003), and was fixed after (1.004). It's now July 2026, so current stock is past it; the 3.6★ is historical. Still worth a glance at the manufacture date on any marketplace unit.
- The priciest replacement cell here (~$1,500–1,800 OEM) — and at ~10,000 hr that cell cost is what drives the 10-year total, the single biggest reason a salt pool gets expensive
- Pentair limits/voids warranty on online or self-installed units, and counterfeit cells are common on marketplaces — another reason to buy through an authorized dealer
If your equipment pad is automated, this is the cell to buy — and really the only one that fits the job. The IntelliChlor Plus40 (part 523735) is the current genuine cell that replaces the discontinued IC40, and it’s the sole option that integrates natively with Pentair IntelliCenter and EasyTouch over RS-485, so your automation can read the salt level and set output. That integration is the entire case for it, because on price it’s the most expensive way to feed a salt pool: the OEM cell runs around $1,500 to $1,800, and since the cell is a salt system’s real recurring cost, the Plus40 is the priciest of these to own over a decade. One catch shows up in its owner score: the early Plus cells had a firmware bug (Pentair bulletin A00709) on units made before October 20, 2025, which is why the Amazon rating still sits near 3.6 stars from those early reviews. Pentair fixed it after that date, and it’s now well over a year on, so current stock is past it — worth a quick glance at the manufacture date on any marketplace unit, but no longer the gamble it was. Get a current unit on an automated Pentair pad and it’s excellent; buy it for an un-automated pool and you’re paying for a data link you’ll never plug in.
Same cell, other sizes: IC20 and IC60
The EverCrystal comes in all three IntelliChlor sizes, and they’re variants of one Amazon listing — so they share the same 4.5-star owner rating. If your pool runs an IC20 (up to 20,000 gallons) or an IC60 (up to 60,000 gallons) rather than the IC40, this is your drop-in: the same aftermarket saving over the OEM cell, sized to your pool, with the same onboard salinity sensor and the same 12-month warranty and no-automation catch.
EverCrystal Replacement Salt Cell for Pentair IntelliChlor IC20 (20,000 gal)
The IC20 size of our aftermarket pickYour pick if you run a Pentair IntelliChlor IC20 (pools up to 20,000 gallons) and want the same aftermarket drop-in as our IC40 pick, sized down — for well under the OEM cell.
“It comes with all the pipes to plumb it (mine cracked with this install). No need to go to the hardware store. Install is easy, just screw it on. Tells you what your salt levels are. Just all around great value for the money!”— Valerie, Amazon
- A true drop-in for the Pentair IC20 — same fit, swaps in minutes with no plumbing changes
- Onboard temp/salinity sensor and upgraded flow switch, like the 40k EverCrystal
- Far cheaper than Pentair's OEM IC20 cell — the aftermarket saving, sized for a smaller pool
- No RS-485 / data connection, so it won't integrate with Pentair IntelliCenter/EasyTouch automation
- 12-month warranty — shorter than the OEM's 3-year
- Doesn't publish a rated cell-life in hours; size to your pool
EverCrystal Replacement Salt Cell for Pentair IntelliChlor IC60 (60,000 gal)
The IC60 size of our aftermarket pickYour pick if you run a Pentair IntelliChlor IC60 (pools up to 60,000 gallons) and want the same aftermarket drop-in as our IC40 pick, sized up — for well under the OEM cell.
“Easy to install. Powerful and works well. I have used it now for a couple of weeks. No WiFi connection but that's fine for me.”— Mehdi S., Amazon
- A true drop-in for the Pentair IC60 — same fit, swaps in minutes with no plumbing changes
- Onboard temp/salinity sensor and upgraded flow switch, like the 40k EverCrystal
- Far cheaper than Pentair's OEM IC60 cell — the biggest-pool size of the aftermarket saving
- No RS-485 / data connection, so it won't integrate with Pentair IntelliCenter/EasyTouch automation
- 12-month warranty — shorter than the OEM's 3-year
- Doesn't publish a rated cell-life in hours; size to your pool
The generic IC40 cells: read this before you save $300
Search “IC40 replacement cell” and you’ll get a wall of near-identical no-name listings undercutting everything above — Aqualix, Blue Works, and a dozen unbranded cells at $300 to $700. Some are fine; many are not, and the listing won’t tell you which. Three things separate a real bargain from a two-season throwaway, and you have to check them yourself because the cheap sellers bury them:
- Rated cell life. You want a cell rated for 8,000–10,000 hours. The cheapest cells quietly ship 3,000–5,000-hour electrodes, or don’t publish a number at all — treat “not published” as a warning, not a neutral.
- Plate size and count. A salt cell makes chlorine off its titanium plates; smaller or fewer plates mean less output and a shorter life. A cell that’s physically lighter than the one it replaces is a tell.
- Warranty. Most no-names give one year; the better aftermarket cells give two to three. Warranty length is the maker’s own bet on how long the cell lasts — read it as a durability signal.
Because the cell is a recurring cost, the number that actually matters is cost per year — price divided by how long it lasts — not the sticker. A $400 cell that dies in a year is worse than a $940 cell that runs five. That’s the same math we run across every salt system in our Salt Cell Cost Index, and it’s why a proven, longer-lived cell wins even when a cheaper one exists.
How to choose an IC40 replacement cell
Start with automation, because it’s the one true fork. If your pool runs on Pentair IntelliCenter or EasyTouch and you want to keep the salt cell on that automated pad, buy the genuine Plus40 — no aftermarket cell carries the RS-485 link, full stop. If your pad isn’t automated (most aren’t), that entire advantage is inert, and an aftermarket cell like the EverCrystal saves you real money for the same chlorine.
Then judge the aftermarket cell like a consumable, not a gadget. Match the size to your unit (IC20/40/60), favor a maker that publishes a rated cell life and backs it with more than a one-year warranty, and weigh the owner rating on the exact cell over the marketing copy. A cell you’ll replace again in five to seven years is bought on cost-per-year and proven longevity, not the lowest price on the page.
Remember the whole system is fine — you’re only replacing the cell. The IC40 power center on your wall still works and is still supported; Pentair just renamed the cell from IC40 to Plus40. Any of these cells drops into it, so don’t let a salesperson talk you into a whole new salt system when a cell is what died. Got a Hayward pool instead? The verdict flips — there the genuine TurboCell earns its premium over the aftermarket copies, for the reasons we walk through in our Hayward TurboCell replacement-cell guide. And if you’re weighing whether salt is even worth keeping, our guide to the best salt water chlorinators of 2026 runs the real cost of a salt pool versus chlorine.
FAQ
What's the best replacement cell for a Pentair IntelliChlor IC40?
For most owners it's an aftermarket cell — the EverCrystal IC40, a genuine drop-in that fits the same IC40 harness and adds its own onboard temp/salinity sensor, for about $940 versus roughly $1,500 for Pentair's OEM cell. It's the most-proven aftermarket option we found, at 4.5 stars across 27 Amazon ratings. The one reason to pay for the OEM Pentair Plus40 instead is automation: if your pool runs on Pentair IntelliCenter or EasyTouch, only the genuine cell talks to it. Aftermarket cells save real money but have no RS-485 data link, so your automation can't read or drive them.
Is an aftermarket salt cell safe, and will it void my warranty?
It's safe, and there's usually no warranty to void — the cell is the consumable part of your salt system, separate from the power center on your wall. An aftermarket IC40 cell plugs into that same existing power center, so you're not modifying anything Pentair covers. What you are giving up is coverage on the cell itself: aftermarket cells carry their own, usually shorter, warranty (the EverCrystal is 12 months versus the OEM's 3 years). The real trade-offs to weigh are warranty length, whether the maker publishes an honest rated cell life, and automation compatibility — not safety.
How much does a genuine Pentair IC40 replacement cell cost?
The OEM replacement runs about $1,500 to $1,800. Note that the original IC40 cell (part EC-520555) is discontinued — Pentair replaced it with the Plus40 cell (part 523735), which drops into the same IC40 power center. Aftermarket cells for the IC40 range widely: proven premium options like the EverCrystal run about $940, while no-name generics can be $300 to $700. The cheapest ones usually cut the warranty to a year and don't publish a rated cell life, which is exactly where buyers get burned.
Will an aftermarket cell work with my Pentair automation (IntelliCenter or EasyTouch)?
No. Aftermarket IC40 cells like the EverCrystal and APX do not carry the RS-485 data connection the genuine cell uses, so a Pentair automation system (IntelliCenter, EasyTouch) — or a Jandy or Hayward controller — can't see the cell, read your salt level, or set output. You can still run the cell on its own controls, but you lose the automation integration. If keeping everything on one automated pad matters to you, buy the OEM Pentair Plus40; if you set your salt output and leave it, the aftermarket cell is the smarter spend.
My IC40 is discontinued — what do I actually buy?
Your IC40 power center (the box on the wall) is fine and still supported; it's only the cell that wears out. Pentair replaced the IC40 cell (EC-520555) with the Plus40 cell (part 523735), which is the current OEM drop-in. Both the OEM Plus40 and aftermarket cells like the EverCrystal or APX plug straight into your existing IC40 power center — you do not need to replace the whole system. So the real choice is just OEM versus aftermarket for the cell, which is what this guide settles.
Are the cheap $300 to $700 generic IC40 cells any good?
Buyer beware. This is where the biggest gap between price and value shows up. Many of the cheapest IC40 cells carry only a 1-year warranty and use smaller titanium plates or shorter cell lives (3,000 to 5,000 hours) versus the 8,000 to 10,000 hours you actually want — and their star ratings are often thin or padded. Before you buy on price, compare three things apples-to-apples: plate size, rated hours, and warranty. A proven 4.5-star cell like the EverCrystal at about $940 is worth more than a no-name at half the price that dies in two seasons — the cell is a recurring cost, so cost-per-year is what matters, not the sticker.
Update history
- July 2026 — First published. EverCrystal aftermarket IC40 cell = best value (4.5★/27, about $940, roughly $560 under the OEM); Pentair IntelliChlor Plus40 = the pick only if you run Pentair automation (aftermarket cells have no RS-485 link). Buyer-beware on the sub-$700 generic cells with 1-year warranties and unpublished cell life. The OEM IC40 (EC-520555) is discontinued — the OEM path is now the Plus40 (523735).
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