TFP's recommend CH level for a plaster pool is 250 - 350 ppm. My current readings are:
FC - 3.5
CC - 0.0
pH - 7.5
Alk - 80
CH - 225
CYA - 30
Last year, CH was about 250 all season. This year I have been at 225. I test using Talor test kit (K-2006).
This is my 3rd season with pool. Pool was installed in May 2012. Water and plaster look good.
I haven't done anything at this point, but wanted to know if I should be worried and start to get the CH above 250.