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I am having a similar issue, and I think the high TA fill water is also the culprit. My fill water is TA 140, which I just measured for the first time today. I can knock my PH down to 7.0 or less with a gallon of 14.5% MA, aerate over the weekend with my aerator water falls, and bring the TA...

I bought this house a few months ago with what I think is black algae. My CYA was off the charts so I drained. See this thread for that http://www.troublefreepool.com/need-advice-for-draining-pool-t39714.html Here is my current pool chemistry, FC 25 CC 0 PH 7.6 TA 120 CH 525 CYA 65 I have...

First my chemistry, which will tell you why I want to drain: FC - 3.5ppm CC - 0 PH - 7.6 (5 drops to 7.2 acid demand) TA - 130ppm CH - 1675. Seriously CYA - off the scale, well over 100. Pool store said 120, k2006 reads half way to 100, so maybe 150 I bought this house with pool a couple...