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All around my pool, the tiles above the waterline have become covered in a darkish substance, only in the last two days. I've searched for similar posts but couldn't find anything. I brush weekly (just did a thorough on one Sunday). The water looks good and my test results are: FC: 2.4...

Just joined, done all my homework and have been testing for a few weeks as the end of my complimentary pool servicing approaches. They will likely leave me with these numbers, any final comments I should make to them? FC: 16 CC: 1.0 pH: 7.8 TA: 150 CH: 450 CYA: 45 13,000 gallon outdoor pool...