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My pool is about 2 years old (gray plaster)and recently I've noticed that there has been a lot of white marks appearing on the bottom> Some small and some quite large. In the deepest end there's a very large spot that looks like something was spilled(kind of like a big splash mark). Any Ideas...

Hi Guys just did all the test's with new test kit. What do you think? FC 2.5 CC .5 Tc 3.0 PH 8.2 (always has been on the high side) TA 120 CH 550 (never really got it to turn a blue more purple) CYA 40 any feedback?

Had a lot of ash in pool after fires in San Diego . Cleaned all debris from pool,filtered for 2 days now pool looks green. Have high chlorine levels(5ppm)and ph is around 7.5 any ideas to get pool back to blue