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  1. M

    Black Algae

    I am in need of advice. I have a SWG and have black algae mainly in the hot tub. It is a relatively small amount. There is also a small amount on the pool wall. I had my water tested yesterday and here are my results. FAC - 0 TAC -0 Salt-3100 CH-200 CYA-0 TA-140 ph - 8 Acid -5 I added 27 oz...