Since I have a vinyl pool, I've taken Carl's advice and never bothered with the CH test. I am curious though what Ben's idea of a too high calcium reading is? We live in an area with very hard water - 469 ppm. Is this too high?

Thanks,
Mary

16k IG vinyl
FC 4.0
CC 0
PH 7.5
CYA 29
ALK 240 (working on it now)
temp 80