I read the section on CSI in Pool School and used Pool Math, but I don't know how the result is calculated, or how to interpret it.
I'm in Tucson. The water here is alkaline and hard as a rock as far as dissolved solids. Calcium scaling along the water line is evident in most of my friends' pools, and kept me from getting the cobalt blue tile I really wanted.
So here I am with my new pool and I want to figure out how to avoid the problem. My pool guy says they charge $800 to blast it off somehow and it comes back in a few months -- not my idea of fun.
So, here's where we stand today:
Temp = 92
CH = 400
TA = 100
pH = 7.2, but that's just because I really lowered it so I could go out of town for a few days and it wouldn't creep above 8. Normally it's at 7.8 or at best 7.6.
Pool Math says C.S.I. = -0.4
Which seems okay but I'm not sure I want to, or can, keep my pH at 7.2.
What's my best strategy? Surface is pebblefina.