Salt systems
Salt cell: clean it or replace it?
A salt cell that has stopped making enough chlorine is either scaled, which cleaning fixes, or worn, which nothing fixes. Hayward, Pentair and Jandy each give a way to tell the difference, and Pentair gives a design life in hours. Here's how to decide, what the manuals say shortens a cell's life, and why East Valley water makes this a regular question.
$120 diagnostic, credited toward your repair · set pricing on many common repairs and installations
When a salt system stops keeping up, the cell is the first suspect, and it's the most expensive part. But "the cell" can mean two very different things. A scaled cell is coated in mineral deposits and can't pass current properly. Cleaning fixes it. A worn cell has used up the coating on its plates. Nothing fixes that, and cleaning it again only costs you time and acid.
The manufacturers give you ways to tell which you have. This guide pulls them together. If your system is showing a light or code and you're not sure the cell is the problem at all, start with salt cell not producing chlorine, which covers flow switches, cold water, chemistry and the other causes first.
Safety first
Turn off power to the salt system before removing the cell; Hayward says so in its maintenance instructions (Hayward Aqua Rite manual, p. 8). Cleaning a cell means muriatic acid. Pentair's instructions are to wear rubber gloves and eye protection, always add acid to water and never water to acid, and work in a well-ventilated area (Pentair IntelliChlor guide, p. 20). If the breaker for the salt system or pump keeps tripping, leave it off and call; that's an electrical problem, not a cell one.
Step 1: Look before you clean
Take the cell out and look through it toward a light. Scale is a light-colored, crusty or flaky deposit on the plates. Hayward says that if no deposits are visible, put the cell back (Hayward Aqua Rite manual, p. 8). It adds one exception: a cell can look clean and still need cleaning if the salt reading is off or chlorine output has dropped (Hayward AquaRite guide, p. 13).
Pentair builds a test into the cleaning itself. Before acid washing, it suggests blasting both ends of the cell with a garden hose on the jet setting, because most buildup is slushy and blows out. Then, when the acid solution goes in, if there's no vigorous foaming, the blades don't need cleaning, and you stop (Pentair IntelliChlor guide, pp. 19–20). Foaming is the scale dissolving. No foam, no scale.
Step 2: Clean once, properly, then check again
If there is scale, clean it following your manufacturer's instructions, reinstall it, and give the system time to settle. Then look at what it tells you:
- Hayward: if the Inspect Cell light stays on after a thorough cleaning, the cell may be worn and need replacing (Hayward Aqua Rite manual, p. 8). Its troubleshooting section says the same from the other direction: if the pool has the right amount of salt and Inspect Cell is still lit, the cell may be worn (p. 15).
- Pentair: on an IntelliChlor, check the cell's usage hours (below) before deciding.
- Jandy: after the first few months of monthly checks, a clean cell only needs re-checking at the end of each swimming season (Jandy AquaPure manual, p. 37). A cell that scales again quickly points at the water, not the cell.
One clean that doesn't help is information. Repeated cleaning that doesn't help is damage: Pentair says not to leave acid in the cell for more than 30 minutes, and that excessive acid washing damages the blades (Pentair IntelliChlor guide, p. 20).
Step 3: Check the hours, if your cell counts them
Pentair is the only one of the three that publishes a design life. The IntelliChlor is designed to run for about 10,000 hours before it needs replacing, or roughly five years of average use, and it has a built-in usage meter (Pentair IntelliChlor guide, p. 19). To read it, press and hold the More button for three seconds until the lights scroll. One output light stays lit:
| Light lit | Hours of use |
|---|---|
| 20% | 2,000 |
| 40% | 4,000 |
| 60% | 6,000 |
| 80% | 8,000 |
| 100% | 10,000 |
A cell showing the 100% light that is clean and still can't keep up is at the end of its design life. A cell showing 20% that can't keep up points first to something else: scale, flow, salt or chemistry.
Hayward and Jandy don't give a design life in the manuals we've checked, so we don't quote one. Figures you'll see online for years of cell life aren't from those manuals.
Step 4: Know what aging looks like
A cell can age without failing outright. Hayward explains that as a cell ages, the salt level the system calculates drifts lower than the real salt level. If the cell is clean and an independent salt test shows the right level, that's aging, and it's acceptable as long as free chlorine is where it should be. Hayward is emphatic: never add more salt in that situation (Hayward AquaRite guide, p. 43). If free chlorine does drop, Hayward's advice is to raise the output setting in steps, 25% at a time, then wait 24 hours and retest.
The decision, in one table
| What you see | Likely answer |
|---|---|
| Visible scale, chlorine low | Clean it |
| No scale, no foaming in the acid test, chlorine low | Not a scaling problem. Look at flow, salt, stabilizer, pump hours and the controller first |
| Cleaned properly, Inspect Cell still on, salt confirmed correct | The cell may be worn (Hayward) |
| Clean, good salt and flow, can't keep up, IntelliChlor meter near 10,000 hours | Worn; replace it |
| Salt reading low but an independent test is fine, chlorine fine | Normal aging. Don't add salt |
| Scales up again within weeks | Clean it, then fix the water balance. The cell isn't the root problem |
What shortens a cell's life, according to the manuals
You can't stop a cell wearing out, but the manuals list several ways to wear it out faster:
- Too much acid washing. Excessive acid washing damages the blades (Pentair IntelliChlor guide, p. 20). Clean when the cell needs it, not on a calendar.
- More self-cleaning than it needs. Pentair says the IntelliChlor's automatic self-cleaning cycle tends to reduce the cell's life, so it should be used only as much as needed to keep scale down (Pentair IntelliChlor guide, p. 8).
- Running at 100% when you don't need to. Both Pentair and Jandy say a lower output setting rests the cell part of the time, which prolongs its life (Pentair IntelliChlor guide, p. 15; Jandy AquaPure manual, p. 34). Set it to the level that holds your chlorine, not the maximum.
- Rock salt. Both say not to use it, because its insoluble impurities can shorten the cell's life (Pentair IntelliChlor guide, p. 11; Jandy AquaPure manual, p. 29).
- Metals in the water. Pentair says copper, iron and manganese can damage the cell and shouldn't be in the pool at all (Pentair IntelliChlor guide, p. 19).
- Running flat out through a cold winter. Jandy says running the chlorinator 24 hours a day through the winter in extremely cold water can shorten the cell's operating life, and that it can be necessary to run at 10–20% or turn it off (Jandy AquaPure manual, p. 34).
- Dry acid in a dry climate. Jandy warns against using dry acid to adjust pH in arid areas with heavy evaporation and little fresh water added, because its by-products build up and can damage the cell (Jandy AquaPure manual, p. 37).
Why it comes up so often in the East Valley
Hayward says calcium and pH have the biggest effect on how often a cell needs cleaning (Hayward AquaRite guide, p. 13), and the water here is hard to begin with:
- Chandler: 10.1 to 16.8 grains per gallon (City of Chandler 2025 water report, p. 3).
- Mesa: an average of about 12 grains per gallon in the City Zone and 16 in the Eastern and Southern Zones (City of Mesa 2025 water report).
- Queen Creek (Town water): 6 to 17 grains per gallon (Town water FAQ).
- EPCOR's San Tan system: 15 to 18 grains per gallon (EPCOR 2025 San Tan report).
Summer evaporation concentrates those minerals, because the water leaves and they stay. More detail on local water is in our Chandler and Queen Creek pool owner guides. The practical upshot: scale is a routine visitor here, so a cell that scales isn't necessarily a cell that's failing. The real question is whether it comes back to full output once it's clean.
When to call
Call when you've cleaned the cell properly and it still won't produce, when you can't tell whether it's the cell, the flow switch or the control board, or when you'd rather not handle the acid. On a salt system visit we check the cell, the flow and salt sensing and the controller, tell you whether the cell needs cleaning or replacing, and give you the price before any work starts. Cleaning and replacing a cell are both work we do, and common jobs like these have a set price.
If you don't know what's wrong, a diagnostic is $120, and it's credited toward your repair if you go ahead. Start from salt system repair, or answer a few questions in the Pool Problem Finder. If you have a Jandy AquaPure showing a code, see our AquaPure service code guide; if the system reports low salt when your test says otherwise, see low salt when the water tests fine.
Sources
Every manufacturer and utility statement above links to this list. Page numbers are the printed page numbers in each document.
- Hayward Industries, Aqua Rite Electronic Chlorine Generator Operation and Installation Manual, Rev P (2010).
- Hayward Industries, AquaRite Troubleshooting Guide, Residential, TSG-AQR159d (2017).
- Pentair, IntelliChlor Salt Chlorine Generator Installation and User's Guide, P/N 520589 Rev. R (8/7/23).
- Zodiac Pool Systems, Jandy AquaPure Installation and Operation Manual, H0325600 Rev F.
- City of Chandler, 2025 Drinking Water Quality Consumer Confidence Report.
- City of Mesa, 2025 Water Quality Report.
- Town of Queen Creek, Water: Frequently Asked Questions.
- EPCOR, 2025 San Tan PWS Water Quality Report.
Hayward, Aqua Rite and TurboCell are trademarks of Hayward Industries. Pentair and IntelliChlor are trademarks of Pentair. Jandy and AquaPure are trademarks of Zodiac Pool Systems. They are named here only to identify equipment.