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ok did the vitamin c test. the stain comes off some. can i use "metal control" says it helps prevent stains scale & cloudy water and if i can how soon before or after adding shock?

Pool is crystal clear, but along sides, only on deep end, is a hard green scale that is spreading. We have tried hard bristle brushes, underwater preasure wash (like the guy we hired used) and even tried scrubbing it off with chlorine tablets. The scale starts about a foot down from water...

Hi , Im a new member here and have an inground vinyl pool. My problem is green on sides of pool. We had it cleaned professionally, it was great. We did all the chemical process we were told then it started raining . so we shocked more. green still there. Tried scrubbing to no effect. Its lie its...