Thanks - I asked because I was looking at CSI numbers and trying to determine what mine would look like over the winter as temps drop etc.
My current numbers:
FC 12
pH 7.8 (measured even though above 10 - I've had pretty good luck with a quickly read test - but I will not take action until I'm below FC 10 just to be sure)
TA 70
CH 260
CYA 50-55
Salt Unknown but > 0 (none added except via Chlorine)
Borates unknown (none added by me ever)
water at 70 degrees
Vinyl In ground pool
Assuming Salt is 500ppm for the heck of it:
CSI: negative 0.05
(so far so good... even with Salt at 0ppm this is a -0.02)
With water temp down around say 50 degrees and chlorine down to 3 this drops to -0.24, and if I drop the pH to 7.2 the CSI index is now an aggressive -0.8! With Vinyl this may not matter, but I'd like to know before dropping pH that far.
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