13,500 gallons, plaster pool
I was concerned about my CH going up (now 650). I read various posts about watching the CSI. With the Pool Calculator, my CSI is like -0.56. So it appears to be at risk for leaching calcium from the plaster. However, if I start plugging in numbers in the calculator, I would have to get the CH up to 1500 to get the CSI out of the "danger" zone to -0.2.
My pool has been fine for 2 years...no scale, no SWG problems. So, do I worry about leaving the CH "too low" at 650? (...but it seems like this is a a high CH according to the suggested levels)....or do I need to take the CH up even more?
Thanks for any input!