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I've tried all sugestions above but stains(grayish/black)are continuing to get larger. Trichlor tablets and vitamin C tabs resulted in no change in color of these stains. Water is balanced but have no idea what to do next. Pool is solar heated and temp stays beteen 88 to 90 degrees. Pool is...

Help Just converted to a SWG a couple of months ago. I have a pop up pool cleaner system and around the pop ups there are black/gray streaks around each one. I have had these streaks for awhile but are getting worse. There are also the same streaks on the wall under side jets. These streaks...