Good Calcium hardness number?

[lstinthot]

Reading another tread it stated to keep calcium between 200 - 400. I do have some spots of pitting in my plaster. The pool is 10 years old and I don't think the previous owner ever tested for CH. I raised it some when we moved in, it is now 180ppm.

results from this mornings test:
Ph 7.2
TA 110
CH 180
CYA 60
CL 4.5
CC 0

I started another tread in the Cl` section that should probably be here, I was asking about raising my borate levels up to get the Ph up. Do not have a borate test kit/strips yet.

Could it be possible the pitting is due to years of low CH? The pits are kind of discolored compared to the other parts of the plaster.