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    "dirt" appears on pool bottom as a result of filtering

    I am experience a perplexing phenomenon. My pool is 16X32, 3.5' to 7.5' deep vinyl. I am not losing water unusually. I am getting a noticeable amount of what appears to be dirt after filter has run. I have a Fury Robot that vacuums the pool excellently. I have not found any tears or leaks...
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    Ph level frozen 7.2<Ph<7.4

    After reviewing topic, "Raising Ph", I suspect borate level > 50ppm. I have used Borax to increase Ph all of last season and the start of this season. I prefer that my Ph be nearer 7.6, but no Ph increaser has been effective - I tried aerating overnight, too. I am not too concerned because...