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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...

I purchased the K-2006C, alk was a little high, 117 after factoring for 90 CA. I decided to do nothing immediately. After 3 weeks I aerated 2 nights. PH is now 7.6 and has held steady for 2weeks. I am glad that I did not over react.

I didn't include that pool is about 20K gallons. I had to increase TA and Ph, so I added AH Baking Soda. PH did not move, so I added 8lbs Borax (gradually, this all has taken place over the past 3 weeks.) My TA jumped to 130, so I brought that back with muriatic acid - ph unaffected. I will...

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...