Overnight FC loss from 11.5 to 7..... so, time to shock. If I look at the Chlorine/CYA chart, with my CYA at 80 (about the only thing in my pool where I want it!), it recommends FC to 30ppm (SWCG). However, Pool Calculator, based on my current readings for TA, Borates, CH, CYA calculates 21ppm. I shocked to 21.... do I need to go to the 30 number?
I have a pretty Irish looking pool now, by the way. Is that to be expected?
It's exciting to "be in control" of what's in the pool - as opposed to at the mercy of the pool store - but, I'll sure be glad when I get to some level of stability!