A salt chlorinator cell is one of the most expensive single components on a residential pool equipment pad — replacement cells run $200 to $500 depending on the brand and size. The good news is that most cell failures are either preventable or predictable well in advance. A trained eye can assess cell health in under two minutes without any specialized equipment. Here is the inspection protocol.
Turn off the pump and the salt system at the controller. Unplug the cell cable connector. Unscrew the cell from the plumbing unions — most cells have two unions, one on each end, that unscrew by hand after depressing the collar or turning the wing nut. Have a bucket ready to catch water from the cell housing as you remove it. Take the cell to a well-lit area for inspection.
The cell plates — thin parallel titanium blades inside the housing — should be clean and metallic in color. Light to moderate calcium scale appears as white or off-white deposits between and on the plates. This is normal, especially in hard water areas, and is cleanable with a mild acid solution. Heavily scaled cells lose chlorine production efficiency because the scale insulates the plates electrically.
After thousands of hours of operation, the ruthenium/iridium coating on the titanium plates wears away. This appears as a dull, gray, or mottled surface rather than a clean metallic sheen. Pitting, uneven texture, or areas where the plate material itself looks compromised indicate end-of-life. Cleaning will not restore chlorine output when plate degradation is the cause — the cell needs replacement.
Inspect the housing for cracks, particularly at the union threads. Check the cell cable connector for corrosion, broken pins, or cracked insulation. Look at the cell end caps for warping or melting — this indicates the cell ran hot, possibly from scale-induced electrical arcing.
Hold the cell up to a bright light and look down through the plates. You should see clearly through every gap between plates. If scale is filling those gaps, cleaning is needed. If the gaps look clean but the plates themselves look dull or pitted, the cell is aging out.
If scale is present but plate condition is still good, an acid wash will restore most of the lost output:
Never use undiluted muriatic acid or a stronger ratio — it destroys the ruthenium/iridium plate coating that makes electrolysis possible and permanently damages the cell. Always use 1:10.
After cleaning and reinstallation, run the system for 24 hours and check:
| Brand | Typical Cell Life | Rated Hours |
|---|---|---|
| Hayward AquaRite | 3–7 years | 10,000 hrs |
| Pentair IntelliChlor | 4–6 years | 10,000 hrs |
| Jandy AquaPure | 3–5 years | 10,000 hrs |
| CircuPool | 5–8 years | 15,000 hrs |
PoolLens logs installation dates, cleaning records, and salt readings for every salt system on your route. Know exactly when each cell is due for replacement before the client asks. Free for pool professionals.
Open PoolLens Free →Cap one end of the cell with the provided acid wash stand or a PVC end cap. Mix one part muriatic acid with ten parts water (acid into water, never water into acid). Fill the cell with the solution and let it soak for 5–10 minutes. Do not exceed 15 minutes — prolonged acid contact damages the titanium plates. Rinse thoroughly with fresh water before reinstalling.
Most salt cells are rated for 10,000 to 15,000 hours of operation, which translates to approximately 3–7 years depending on run time and water chemistry. Pools with consistently poor pH balance (below 7.2) see dramatically shorter cell life due to acid attack on the titanium plates.
Partially. Heavy scale is visible and cleanable. Actual plate degradation — where the metallic coating on the titanium plates has worn away — appears as a dull, gray, pitted surface rather than a clean metallic sheen. A cell with plate degradation will not generate chlorine regardless of how much you clean it.
The top causes are: chronically low pH (below 7.2), which accelerates plate corrosion; chronically high calcium hardness (above 500 ppm), which causes heavy scale; running the cell at 100% output for extended periods; and infrequent cleaning allowing scale to accumulate and electrically short the plates.