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After firing my pool guy cause I was still getting greenish spots on the walls, came here and ordered test kit and have been monitoring my pool and adding cholrine as needed. Issue is my walls are still getting worse and the floor is turning color too. Pool is 18000 gallons with diamond bright...

I have a kidney shaped pool with about 18K gallons in Miami FL. Had a pool guys taking care of it but fired him due to some green areas on the wall. Orderd a test kit and the readings are as follows: FC 4.5 CC 0 TC 4.5 Ph 7.2 T/A 60 CH 460 CYA 50 How can I figure out if I need to add...