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I have attached a photo of something growing on my concrete pool. It is soft, and a dark green color, although photo makes it look almost black. It grows generally on the north side of the pool, starting on the steps. My water chemistry has been good throughout the 6 years I have had the...

Earlier this summer, my pool was doing great, with swg set on 20%, fc at 3, cc at 0, cya at 25. After returning from one week vacation, I found fc at 0,cc at 0.5, and cya at 0, and a little algae on side wall of one corner of the pool. I bumped the swg to 40% and started adding 7 lbs of cya...

Just tried to test CH in my new pool filled with city water (Copper .668 ppm) with the tft100 test kit, and the pink solution precipitates into slightly purple particles, with the solution becoming almost clear, but will never turn blue. Is this amount of copper causing this test to fail...