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I have tried the black algea shocks/treatments and still have the black in spots on the side of my concrete pool. I have been told that the algea "implants" itself and is very hard to kill...we also have a hot tub that flows into the pool..I tried draining it and spraying Clorox on it and it killed the algea and no return. What I need to know, will I damage the pool if I drain the water down 3-4ft, and they spray the concrete with Clorox?
Draining some water and treating with liquid chlorine would not create any problems. It will destroy any algea that has implanted itself into the surfaces you treat.
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