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In my vinyl lined, sand filter pool (35'long x 17'wide, oval) I have one return. I am relatively new to TFP, but have gotten rid of a really bad green algae problem. I have one issue left - the deep end never clears up. My deep end is 8' 6" and the shallow end is 3'. The return is at the deep...

So through my tests I have discovered that my CYA is 100+, all due to trichlor. I have turned off my chlorine feeder and removed the remainder of the trichlor tabs. I have dropped my pool water to an inch or two below the skimmer once and brought it back up in attempt to get CYA to good normal...

I have a 23K gallon, vinyl lined, in-ground pool, with a Hayward pump and 300 lb sand filter. Water is green with algae, even though my water condition is good (pH: 7.4, Chlorine 5+, TA 100). Pump is running 24/7. Shocking every few days to try to get rid of the algae. Even changed the sand out...