Balancing water

[reneec]

I am trying to balance my water and unsure exactly what to do.
I have a 20,000 gallon inground vinyl pool.

My current numbers are
FC 5
CC.5
TC 5.5
PH 7.5
TA 220
CH 30
CYA 20
CSI .48

I know that my TA is high, but am not sure if I should worry about it. Pool school says don't raise it to just get a number.
Also wondering about my CH of 30. I know that should be higher, with a vinyl pool do I need to worry about it? I do know I need to raise my CYA with Stablizer and am working on that.

 

[Richard320]

You can lower TA (and CSI) by lowering pH to about 7.2, aerate it somehow, and repeat it every time the pH gets back up around 7.8 until the TA is down. You already have CYA covered. Vinyl pools don't need Calcium to protect the concrete walls from etching. But if CSI is high, you could get scaling, even on vinyl, and you won't be able to use a wire brush to loosen it.