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    Mustard Algae (I think) on pool floor despite high FC

    Fiberglass pool with FC 16.5 CC <0.5 CYA 40 Ph 7.6 CC Chlorine level seems to be holding yet there is light brown greenish algae on the bottom of the pool in corners etc. There is also the white/gray "dust" that I assume is dead algae. No algae is growing on the walls (which I had last time I...