We look after about 50 pools and have a couple which have above water staining, that has turned the blue tiles sort of greyish, cant seem to remove using normal type products anyone have any idea?
For oils causing the scumline, I use a moist 'scrubbie sponge' with a little pH up powder (sodium carbonate) or Alk + (baking soda - sodium bicarbonate) sprinkled on it. It's cheap, cause you already have it on hand and works well
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