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So I am almost positive we have stubborn fertilizer stains in my vinyl pool. They look like little iron spots all in the shallow end. I tried using vitamin c tablets but for some reason they made the stains darker and worse. I tried rubbing a chlorine tablet on it...again no results. Shocked the...

So not to long ago, I thoroughly backwashed my Hayward Pro Grid DE filter 48 square feet. Also before that I clean out each individual grid, there were no rips or tears however I did find some broken plastic inside a few of them, but not incredibly broken. After putting everything together and...