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I have high CYA (the TFT test kit confirms it at 100) and my chlorine level won;t go back to a normal range after two shocks to defeat algae. So I want to drain my pool by 1/3 and get the shemistry back to normal. Anything I whoul dbe aware of or careful of when I drain the pool? I am using...

A few weeks ago we came back from vacation to find a family of ducks in the pool. We got them safely relocated, but were left with algae on the walls. I've shocked, brushed, backwashed and vacuumed a few times, but it still keeps coming back. Currently I've got very high Free Chlorine of...