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Pool was clean all year, but two weeks of high 80s, low 90s temps in New England brought on sudden infestation of mustard algae once the temp broke briefly (we've had some up and down temps after weeks of heat). I thought it was dirt at first, then it spread all over the place. I've tried...

Quick background info: First opening in new house, bought during winter, was told the pool was in use and operating this past season This is a Hayward SP0710XR50 Pro-Series Vari-Flo Backwash Valve Tech left an hour ago, kind of rush through the explanation, but long story short the pool water...