Salt cells don't last forever. In South Florida's hard water, most cells last 3–7 years — sometimes less if they're run hard or neglected. Here are the five signs yours is on its way out.
1. Low chlorine output at 100%
You've got the cell cranked to 100% output, pump running 10+ hours a day, and chlorine still reads 0.5 ppm. Clean the cell first. If scale isn't the issue, the plates have lost their coating and the cell can't generate anymore. Replace.
2. Persistent “Inspect Cell” or “Low Flow” errors
Every salt cell controller has a few common error codes:
- “Inspect Cell” — usually scale buildup. Clean first.
- “Low Salt” with salinity actually in range — cell sensor is failing.
- “Low Flow” — check pump and filter first; if those are fine, the flow sensor inside the cell has failed.
If an error persists after cleaning and 2–3 power-cycles, the cell is toast.
3. Visible plate erosion
Pull the cell and look inside. The plates should be smooth gray titanium. If you see:
- Pitting
- Flaking black or brown coating
- Plates that are visibly thinner or bent
…the cell is end-of-life. Any further use burns more electricity without making more chlorine.
4. Salt reading doesn't match reality
Use a separate digital salinity meter or drop-count test and compare to the cell's reading. If they disagree by more than 300 ppm, the cell's salinity sensor is drifting. It's a common early-warning sign.
5. The cell is older than 5 years
Even a well-maintained cell eventually wears out. Once you're past year 5 in South Florida, start budgeting. Replacing on your schedule is cheaper than a 4th of July emergency.
What replacement costs
| Typical price | |
|---|---|
| Replacement cell (Pentair IC-40, Hayward T-15) | $500–$1,100 |
| Install labor | $150–$300 |
| Salinity rebalance after install | $0–$60 (salt) |
| Typical all-in | $700–$1,400 |
Common mistakes on replacement
- Undersizing. Rule: cell rating should be ~2× pool gallons. A 20,000-gal pool needs a 40,000-gal cell.
- Buying off-brand online. Generic cells fail faster and often don't trigger warranty.
- Skipping the controller update. Some older controllers need firmware updates to work with newer cells.
Need yours replaced or assessed? Salt cell replacement service.
Frequently Asked Questions
$500–$1,100 for the cell itself depending on brand and size, plus install labor. Usually $700–$1,400 installed.
Need a pro to handle this?
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