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The Best Pentair IntelliChlor IC40 Replacement Cell (2026): Aftermarket vs OEM

By The Smith Family, reviewed by Brad Smith · Independent, no paid placement · Updated & verified October 16, 2026Prices checked October 2026

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.

Your Pentair IntelliChlor IC40 cell has stopped making chlorine, you’ve priced a genuine replacement, and the number stopped you cold: around $1,554 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.

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.

Aftermarket vs OEM, head to head

Model	Best for	Fits	Max pool size	Controller	Automation	Warranty	Price
EverCrystal Replacement Salt Cell for Pentair IntelliChlor IC40 (40,000 gal)	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 months — stated in the listing only. EverCrystal sells from its own store (evercrystalpool.com) as well as Amazon, and publishes no warranty document on either: the store's warranty pages return 'page not found', and the Amazon listing's warranty link goes to Amazon's generic contact-the-seller page. Nothing to survive or lose between channels — but nothing to appeal to either.	Check price →
Pentair IntelliChlor Plus40 Salt Chlorine Generator (523735)	Best for a Pentair automation pad	Pentair IC40 → Plus40 (523735)	40,000 gal	Integrated LED (salt %, output, cell life)	Yes (IntelliCenter/EasyTouch)		Check price →

Prices move constantly — any Amazon price shown is as of the date noted and subject to change; 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 $610 extra for the OEM buys you a data link you’ll never connect and, if you buy it online, a warranty no longer than the aftermarket cell’s (one year, parts only, per Pentair’s own page — more below). 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, and it is closer than it looks: Pentair’s three years needs a dealer purchase and professional installation, and Pentair’s own page gives a Plus40 bought online one year, parts only — about the EverCrystal’s stated 12 months. The sources disagree (an older Pentair warranty text still on retailer sites says two years for IntelliChlor cells bought online), Pentair publishes no list of its authorized online sellers we could find, and the Amazon buy box on 2026-10-16 was a marketplace seller, Dolce Calma — so on Amazon you cannot confirm which term you are getting, and owners in its critical reviews report claims refused for that reason. 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

Winner

Our top pick

EverCrystal Replacement Salt Cell for Pentair IntelliChlor IC40 (40,000 gal)

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 $610 less than Pentair's OEM cell (about $940 vs about $1,550), for pools up to 40,000 gallons. Two honest catches: no automation (RS-485) integration, and a 12-month warranty.

Sold in 2 sizes on this listing (20K–40K gal) — this card is the 40,000 gal. Check the size before you add to cart.

Your pick if your Pentair IC40 cell died, you don't run pool automation, and you'd rather spend about $940 than about $1,550 on the OEM cell — a 3.9★ drop-in (down from 4.5★ when we carded it, on a base that has nearly tripled since) with its own onboard salinity sensor.

3.9 · 77 owner ratingsacross Amazon · 2026-10-16 · early data · listing-wide base

Check price at Amazon →

Sold by BACKYARD SUPPLY STORE, shipped by Amazon · Free 30-day refund/replacement · read 2026-10-16

Picked before we checked what this link pays us.

Verified owner · 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 buy

Sold in 2 sizes on this listing (20K–40K gal) — this card is the 40,000 gal. Check the size before you add to cart.

Your pick if your Pentair IC40 cell died, you don't run pool automation, and you'd rather spend about $940 than about $1,550 on the OEM cell — a 3.9★ drop-in (down from 4.5★ when we carded it, on a base that has nearly tripled since) with its own onboard salinity sensor.

3.9 · 77 owner ratingsAmazon · 2026-10-16 · early data · listing-wide base

“Literally half the cost of a Pentair replacement. After using it so far, no issues at all. Chlorine levels are consistent.”— Jackie L, Amazon · Verified owner

Pros

• 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 $610 less than Pentair's OEM replacement cell (about $940 vs about $1,550 on Amazon, read the same day) — the whole reason to go aftermarket on an IC40
• 3.9★ across 77 Amazon ratings — an independent, buyable track record unlike the no-name generics, though the average has slipped from 4.5★ as the base doubled

Cons

• Its critical reviews are failures, not quibbles: all ten of the newest (written 2026-07-22 to 2026-10-03) are a cell that died at two to six months, a false low-salt reading, or a controller that cannot see it — and on 2026-10-16 its 77 ratings ran 62% five-star, 13% four-star, 2% two-star and 23% one-star
• 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 — level with the OEM cell's 1-yr ONLINE term (the OEM's 3-yr needs a dealer purchase and professional installation); the specialty-retailer APX P40's 'two-year' is one free year and a second with parts at half 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

What owners complain aboutDefect reports

It does not talk to the controller - owners report it reading low salt, refusing to report to a Pentair or Hayward automation system, or simply dying at two to six months.

14 written critical reviews (the critical filter's count) as of 2026-10-16; the histogram puts 23% of the 77 ratings at one star. All ten of the newest critical reviews (2026-07-22 to 2026-10-03) are a dead cell, a false low-salt reading or an automation system that cannot see it · critical reviews read 2026-10-16

Check price at Amazon →

Sold by BACKYARD SUPPLY STORE, shipped by Amazon · Free 30-day refund/replacement · read 2026-10-16

✓ Safety: no active recallNo active CPSC recall found (checked 2026-10-16: RecallTitle and Manufacturer queries for EverCrystal returned an empty list while a Wybot control returned recall 26372 the same sitting).

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 $610 under the OEM cell — the whole reason to go aftermarket — and it’s the most-proven option we found, at 3.9 stars across 77 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.

We re-read this cell’s critical reviews on 2026-10-16, and you should know what is in them before you buy. The base fell at every read for a year — 4.5 across 27 at launch, 4.2 across 50 in August, 4.0 across 56 on 2026-08-24 — then held at 4.0 across 69 on 2026-09-15, and slipped again: on 2026-10-16 it read 3.9 across 77, with the eight newest ratings averaging somewhere between two and four stars. The shape of the base has not changed — 62% of owners give this cell five stars and 23% give it one, with very little in between — and all ten of the newest critical reviews (July 22 to October 3) are a failure or an incompatibility: cells that died at two to six months, cells reading low salt and refusing to produce, and cells that would not report to a Pentair or Hayward automation system. That last one is not a surprise (this cell has no data connection, which is already the first line of its cons), but the early failures are. The verdict here still stands on the money — the OEM is roughly $610 dearer and the aftermarket field around this cell is genuinely worse — but this is a value pick with a real reliability question against it, not a clean win. If your pool runs automation, the OEM Plus40 is the only cell that works with it — though its own owner record is worse, not better.

Not for you if: you run your pool on Pentair automation, or you want a three-year 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: about what Pentair’s own page gives a Plus40 bought online, and shorter than the three years Pentair gives a dealer-installed one. If you’ll buy from a specialty pool retailer rather than Amazon, the APX Performance P40 is a similar-priced aftermarket cell worth comparing — its own user guide gives one free year and a second year with parts at half price. 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 pad

Your pick if your pad is already Pentair and you want the tightest automation integration — the current Plus40 cell (~$1,550). Its cell is the priciest here to feed, and its 3.3★ owner score is down from 3.6 in July even as its base has grown.

3.3 · 176 owner ratingsAmazon · 2026-10-16

“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 · Verified owner

Pros

• 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

Cons

• Its owner score is down from 3.6 in July to 3.3★ across 176, and all ten of the newest critical reviews (2026-09-08 to 2026-10-08) are failures — several on a second or third warranty cell — even though Pentair fixed the early firmware bug (bulletin A00709, units made before Oct 20, 2025) on later units, so that fix does not explain the record and the cause is not established
• The priciest replacement cell here (~$1,550 on Amazon, list $1,819) — and at ~10,000 hr that cell cost is what drives the 10-year total, the single biggest reason a salt pool gets expensive
• Bought online, Pentair's own page gives it one year, parts only — the three years needs a dealer and professional installation — and an older Pentair text still on retailer sites says two years for online IntelliChlor cells. The Amazon seller (Dolce Calma on 2026-10-16) cannot be checked against an authorized-reseller list, and owners in the critical tail report claims refused because the cell came from Amazon

What owners complain aboutDefect reports

Early failure is the dominant report — units dead within days to three months, several with a sensory-module error the owners say support treats as known. Running alongside it is a warranty problem specific to HOW you buy: multiple owners say a claim was refused or fought because the cell came from Amazon rather than an authorised dealer. One install catch worth knowing before you order: it needs 12 to 18 inches of straight pipe ahead of the cell for flow sensing, which the listing does not mention.

60 written critical reviews (the critical filter's count) as of 2026-10-16; the histogram puts 37% of the 176 ratings at one star. The ten newest critical reviews (2026-09-08 to 2026-10-08) are all early failures, and several describe a second or third replacement cell failing the same way · critical reviews read 2026-10-16

Check price at Amazon →

Sold and shipped by Dolce Calma · read 2026-10-16

✓ Safety: no active recallNo active CPSC recall found for the IntelliChlor Plus40 (re-checked 2026-10-16 with a passing control: RecallTitle and ProductName queries for IntelliChlor return an empty list). Pentair's recalls on file, 21119 (2021), 07073 (2007) and 11230 (2011), are gas pool heaters and drain covers, not salt systems.

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 $1,554 on Amazon (list $1,819), 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, and we have to correct what this page used to say about it. The early Plus cells had a firmware bug (Pentair bulletin A00709) on units made before October 20, 2025, and we wrote that the low rating was history — those early reviews, since fixed, no longer the gamble it was. The listing has since said otherwise. On 2026-08-24 the Plus40 read 3.3 stars across 143 Amazon ratings, down from 3.6 across 119 in July. The average fell while the base grew by 24, which means those 24 new ratings landed somewhere between 1.3 and 2.4 stars. A defect that had genuinely aged out would pull the score up as fixed units accumulate reviews; this did the opposite, and it has kept going: a September 15 re-read put it at 3.2 stars across 157, with 7 of the 10 most recent reviews at 1 star. On October 16 it ticked back up, to 3.3 across 176 — the 19 ratings since September averaged at least 3.25 stars — while all ten of the newest written critical reviews, from September 8 to October 8, are failures, several of them on a second or third warranty cell.

We are not claiming to know the cause — only that “the firmware bug explains the score and it’s behind us” is no longer supported by the cell’s own reviews. Treat that record as current information about current stock. The integration case is unchanged and is still real: on an automated Pentair pad the Plus40 is the only cell that talks to IntelliCenter or EasyTouch. But buy it for that reason, knowing the owner record has not recovered — and 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 launched in all three IntelliChlor sizes as variants of one Amazon listing — which is why the 20k and the 40k carry the same owner rating: one pooled base, proven on 2026-09-15 when both ASINs read the identical figure. As of 2026-09-15 that listing sells two of them. If your pool runs an IC20 (up to 20,000 gallons), this is your drop-in at $750: the same aftermarket saving over the OEM cell, the same onboard salinity sensor, the same 12-month warranty and the same no-automation catch.

The IC60 (up to 60,000 gallons) is the exception, and it’s a channel problem rather than a dead product. That size is no longer on the Amazon listing — the old link now lands you on the 20,000-gallon cell — while EverCrystal’s own store still sells a 60,000-gallon cell, at $1,158 with Add to cart when we read it on 2026-10-16. The IC60 card below links that store, not Amazon; for a 60k pool, don’t assume Amazon can still sell you one.

EverCrystal Replacement Salt Cell for Pentair IntelliChlor IC20 (20,000 gal)

The IC20 size of our aftermarket pick

Sold in 2 sizes on this listing (20K–40K gal) — this card is the 20,000 gal. Check the size before you add to cart.

Your 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.

3.9 · 77 owner ratingsAmazon · 2026-10-16 · early data · listing-wide base

“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 · Verified owner

Pros

• 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

Cons

• No RS-485 / data connection, so it won't integrate with Pentair IntelliCenter/EasyTouch automation
• 12-month warranty — level with the OEM cell's 1-yr ONLINE term (the OEM's 3-yr needs a dealer purchase)
• Doesn't publish a rated cell-life in hours; size to your pool

Check price at Amazon →

✓ Safety: no active recallNo active CPSC recall found (checked 2026-10-16: RecallTitle and Manufacturer queries for EverCrystal returned an empty list while a Wybot control returned recall 26372 the same sitting).

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, and so does the EverCrystal; the APX P40’s “two-year” is one free year and a second with parts at half price. Read the whole document, not the headline number — the length a maker will actually pay for is its own bet on how long the cell lasts.

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.

That running cost is the whole reason a salt pool is an equipment decision rather than a water one — the salt vs. chlorine breakdown puts this cell’s price back into the context of what a salt system actually costs to own.

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 replaced the IC40 cell with the 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. Got a Jandy AquaPure? There it flips the other way — the cheap aftermarket cells leak and die inside a year, so the genuine cell is the smart-money buy (see our Jandy AquaPure 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.

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