The coping and deck around my pool is made of limestone. The stone is disintegrating at a rapid rate. I reduced the water level to below the coping, so there will be less water splashing on to the stone. But in a few days the level went back up, this is texas 100 degree days with no rain. Why does this happen and how can i choose the water level i want ? I released the water by turning the multiport valve to waste and running the pump
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