Brown spots on fiberglass pool
If I'm not doing this right, I apologize profusely. I DID read the new member info. I don't have an answer to the problem; I want to add my question. I don't know how to start a new thread or even if that is the correct thing to do! Anyway, I have, in the last two weeks, developed brown spots on the sides of my fiberglass pool. They're the size of a pencil eraser tip and they dissolve like dirt when I touch them. I'm used to having dirt on the bottom of my pool but dirt has never stuck to the sides of my pool, that I remember. I wonder if it is algae instead? My water is crystal clear and a test strip shows that all chemicals are within the recommended parameters. Thank you.
16' X 34', 18,360 gals fiberglass pool; DE filter; 1 HP pump
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