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    Old or new algae?

    First time pool owner- I've lowered the CYA into 60-80 range. FCL AND TCL is 10+ held overnight (highest on the strip test). Alk is within range. TH is a little low. The algae won't go away! I've vacuumed twice in the last two days, used Algaecide based on directions... kept the filter on. I'm...