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We have a 13,000 gal. Pool in Mesa, AZ. It was opened in Oct 2020. The salt level was set at 3500 ppm. The salt ppm has slowly increased to 5000 ppm. This ppm has been verified by a Pentair tech’s salt tester, pool store testing , a substitute (new) SWG Pentair IC40. The IC40 alerts to both high...

I have several black stains in the deep end of my pool. They are smudge/blotchy like in appearance. They range from a grayish to almost black. They were new this spring. I have tried brushing with a nylon brush and also with a sponge with a scratchy surface on one side. Neither of these work...