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An update: First I vacuumed (to drain) the largest deposits of algae/dirt/etc Next upped the PH to 7.3 Next I added liquid chlorine (10 Liters ~10%) + 3 cups of granulated chlorine. I ran the filter for a few hours and measured: FC:30ppm CC: 0.5 This morning I scrubbed the side of the...

Ok thanks, i'm going to try this SLAM ... one question: My CYA measure read ~24 and FC was already at 11ppm, so according to the Chlorine / CYA Chart am i not at about shock level already?

Pool temp: 80 FC - Free Chlorine: 11.5ppm CC - 1.0ppm pH - 6.8 TA - 100 CH - 300 CYA - 23-24 All measured with TF-100 kit Problem #1: Yellow/Brown build up on pool floor. I vacuumed pool bottom to waste last week and now its all built up again, all the while maintaining 10ppm CL. (attached...