It is brownish not black. It totally disappears when the water is stirred up but settles back when water is calm or overnight. I try vacuuming it up but just reappears, again, again. I just opened pool but this was a continuous problem last year. Working on getting pool adjusted with 12% chlorine and pucks now, going to add some polyquat if I can find it, or algaeside. Would LOVE to solve this problem.
Pool is a SPLASH SUPERPOOL 17x29 4' above ground. Will post readings Thursday. Just dumped 5 gal of 12% liquid chlorine in and have pucks to help raise level fast.
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