I gave some stains forming on my fiberglass pool,and have tried the vitamin C tablet test. The stains did not lesson and cannot be removed unless you take steel wool to them which I do not want to do on clear coat.the stains are brownish in color. I am in a rural area and all water is well water, even the fire department who fills pools around here. Stains are only on flat surfaces like seats and steps. Attached is picture...should I go ahead and to the AA treatment to see what happens?
