Just checking - I think I know what to do but would appreciate some feedback
CYA 90 (dosed it up for sunlight protection)
yielding a CSI of -.36 according to the Pool Calc. As the temp drops the CSI will continue heading down. I have nice fresh plaster and want to keep it that way.
Only things I can do to keep CSI closer to 0 is:
1) drain & refill some water (incoming CH 150ish) resulting in lower CH and CYA
2) raise TA (but makes pH maintenance on the SWG a pain)
3) run pH higher - but even running pH 8 still give negative CSI
Time to drain & refill 1/2 to get CYA and CH lower?
Or dial up TA?