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I have an endless pool that I drained and refilled with water from a garden hose. I see black sedimentation in the floor of the pool. The water coming out of the garden hose is clear and yet there is also all this black substance in the floor of the pool. What do you think this is?

I fell behind on giving chlorine to my swim spa. I now have multiple translucent debris in the pool. My vinyl cover is slimy. I have raised the pool to over 20ppm of Free chlorine (CYA of 30). These flakes are increasing!! Any ideas??

I was lax a couple of days in giving the daily Clorox to my indoor swim spa. I noticed yesterday that my pool water appeared more cloudy. I raised my FC to 10 ppm just before sleeping (CYA at 20). In the morning my FC reading was 6 ppm. The guidelines only allow no more than a 1 ppm drop...

My TFT test kit arrived last week. I have scoured prior forums posts, but still have some questions. 1) I have a 2500 gallon indoor pool. I have added 20 ppm CYA. According to this website's chart, one should keep the free chlorine range form 3 to 5 ppm. Can someone tell me what is the...