We are on our 3rd summer with our 28 foot semi-inground pool. We have a sand filter and the FROG System. Our levels are almost always in the normal range, and my water is very clear, but my big problem is grayish staining on the bottom of my pool. It seems to fade when I need shock it, but then they come back. I am going to be looking for any forums that might discuss my issue. Thanks!
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