Staff Answer
Jul 17, 2026 - 10:13 AM
If the issue is the cell itself, replacing with the APX PERFORMANCE P-Series inner replacement cell for the P40 (housing and electrode only) can restore chlorine generation. These inner cells are designed to replace just the electrode portion while reusing your existing controls. You will need to replace the same size inner cell as the one you are currently using. It’s mostly a plug‑and‑play swap. If the system is not generating chlorine due to another issue based on an error light or water chemistry issue, you'll want to troubleshoot those items first.
Also, here is a general checklist for how to know when to replace a cell:
- Perform independent tests to ensure that the pool water's salinity is in range (recommended: titration-based chemical test, or else a recently-calibrated digital test).
- Ensure that the cell is fully cleaned (multiple times in a row if necessary, so that when fresh cleaning solution is added there is no "fizzing"). Flush cell thoroughly with a hose-end nozzle.
- Ensure that all connections and cables are fully tight, fully seated, and free of debris or damage.
- Ensure that water is completely filling the Cell throughout daily operation, esp. if getting daily repetitive warnings.
- Ensure that the controller has not inadvertently been changed to a different cell-type setting (if applicable).
- Ensure that the water is within normal operating temperatures.
- Power the unit off and on to confirm; if the cell is depleted, and all other issues have been resolved, any warning will come on within the first 1-5 minutes or so of turning the unit on.
If the issue still persists after all checks, and the cell is a number of years old, the cell may be ready for replacement.
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