Hi, I am new to this forum. Or any Forum for that matter. But I am upset enough to try anything. I bought this house in 2003. It came with the pool built in 1992. The Diamond Brite finish was attractive but as the years went by it started getting chips and divots. I had it resurfaced 9/21/15.
It looked great at first but after a few months I started seeing large blob shaped brownish stains mostly on the bottom. The contractor came back and looked at it and said it was from my algaecide. I think he is blowing smoke. He has offered to acid wash it if I drain it.
So I had the Diamond Brite (SGM) rep come out and look at it. He said it was MOTTLING and gave me 2 quarts of a powder (their version of JACK'S MAGIC THE MAGENTA STUFF). He gave me a printout of the procedure. It involved 1 gal of muriatic acid/2 thousand gallons of water. I ran the pump 24/7 and brushed the pool 2/day for 4 days. IT WORKED!
But after a few months the stains came back. I maintain my own chemicals and every time I get the water sampled it is very close to perfect. I use PinchaPenny.
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I am afraid to have the acid wash because it might roughen the surface and promote algae. Who's to say the stains won't come back.
Is there a cure? Thanks