- Improper backwashing could be the reason. Always backwash until the water runs clear in the valve’s sight glass, usually about two minutes.
- You may have live algae causing the filter to clog. By testing the water balance with a test kit and super chlorinating, you should solve this problem.
NOTE: Some test kits may provide inaccurate results, we suggest taking a water sample to your pool dealer for evaluation. Be sure to take a water sample before shocking the pool.
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