Hi grannie, and welcome (back) to the forum!!
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I'll let Pooldoc advise you about this chlorine/ammonia treatment that you're being told about--but I wouldn't try it until he does so. Keep in mind that combining chlorine and ammonia will produce nasty, sometimes fatal gasses. Once they're both in the water that shouldn't be an issue, but just be careful when dealing with this combination. I'm not sure that you can actually kill black algae forever, once you get it--but again, Pooldoc is the one that needs to discuss this with you. I'll alert him to this thread and see if he can help.
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