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I've never thought about the difference in PH reducers. During a year and a half I used PH reducer that contains HCl. But half a year ago I bought PH reducer (H2SO4), not thinking about the difference in it. a month or two ago I've noticed white stains on the surface, tried to clean, but no...

Hello! I've fiberglass pool for two years and everyrhing was excellent. But three month ago all the surface under water started covering with white stains (not even stains but fur). I can't get rid of it with ordinary chemistry. At first I thought it was a calcium, tried Decalcit Super, no...