elizabeth

I heard that there is an epoxy made just for fiberglass pool, you can also do the repair under water. But choose a quality one.

have you tried Acid Wash? Also try Pumice stone will scrub off the black or green algae.

yeah I agree with mumpelnc it was lack of chlorine, The correct amount of Stabilised Chlorine must be used and the filtration must be done for at least 4 hours a day during winter, and 8 hours a day in summer.