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I am accumulating two or three white stains on my fiberglass pool every day. Have been shocking for the last week. 2 lbs of HTH shock every night, and can not keep FC up. I have been mixing shock powder in water before broadcasting in pool, and following up with pool brushing so as not to have...

Hello. New to forum. Getting ready to close my pool this weekend, but within the last few days I've gotten white spots on the bottom of the pool about 4-5 inches in size. They do not brush away. Don't know what these are. Have had metal staining over the season, but took care of that with...