I ran the test again with the Abscorbic Acid. This time I shut the pump down for several hours and made sure that the water was completely still. I mixed 1 pound of Abscorbic Acid with 4 gallons water and mixed solution well. I gently poured solution over the stains and the stains started to come clean.

I have an 8,200 gallon pool. I need more Abscorbic Acid. Does anyone know a wholesaler that sells this stuff cheap? I paid $10 per pound at the pool store.

Thanks,

TheNewPoolGuy