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I have been experienceing cloudy water on and off the past 6 days. The pool was covered and pump shut off for 3 days due to medical emergency. Upone opening, the water ws cloudy. Chlorine was almost non existent. I added 2 gallons of 10% liquid chlorine and the water cleared up and numbers...

Vinyl In-Ground Pool 18500 gallons DE filter I have been testing and maintaining water chemistry for several years with absolutely no problems. This year when opening the pool my alkalinity has been very low. Yesterday, my numbers were as follows: Free Chlorine 8.10...