← Pool Care & Troubleshooting GuideLow Chlorine or Won’t Hold Sanitizer
When chlorine disappears faster than you can add it, the cause is usually one of two things: too much stabilizer, or too much for the chlorine to clean up after.
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Chlorine Lock / High Stabilizer (CYA)
- Test your cyanuric acid (stabilizer) level, since chlorine stops working effectively once CYA climbs too high.
- If CYA is high, the most reliable fix is partially draining and refilling the pool with fresh water to dilute it.
- Switch to an unstabilized chlorine source, like liquid chlorine, for shocks going forward to avoid adding more CYA.
- Retest chlorine effectiveness after dilution, since it should respond normally again once CYA is back in range.
Safety note: Never drain an in-ground pool completely, since an empty pool shell can shift or float in wet soil.
High Bather Load / Heavy Use
- Shock the pool after a pool party or unusually heavy swim day, since body oils and sweat consume chlorine quickly.
- Increase your chlorine feeder or floater output slightly during high-use weeks rather than waiting for a low reading.
- Rinse off before swimming when possible, since this measurably reduces the organic load that eats up chlorine.
- Keep testing daily during heavy-use stretches instead of your normal weekly schedule.
Safety note: Keep chlorine products stored away from direct sunlight and away from any other pool chemicals.