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Hi everyone! I wasn't able to maintain my pool for a while, and I have black algae spots on the bottom, attached to calcium buildup / scale. I can remove them with a small stiff wire brush, but it's time-consuming because I have to weigh myself down to the bottom and scrub each spot. I've...

Hi everyone! Anyone recognize this stain? This photo is from my top step. The white areas on each side of the tiles are what the plaster used to look like. It's visible in the bottom of the pool too. It's not organic. I haven't tried a Vitamin C test yet. Could it be calcium scale?

FC: 5 CC: 0 pH: 7.5 TA: 100 CH: 475 CYA: 40 I just started using TFP about two weeks ago, and my water is looking better than ever. I did an initial SLAM, and my FC levels have been good. However, I've noticed a bit of green algae forming the last two days. I was expecting my FC to be...