What exactly is the significance of Calcium Hardness (CH)? I understand it can manifest itself in either leaching calcium from a plaster pool (which i have) or leaving calcium deposits, but i'm not sure what affects it. Every time I do the CH test, it is the same - 450 or 475. I've been living in this house for about 9 months, and the pool was completely re-surfaced about a year ago. I've had to add in plenty of water (due to evaporation, and lettings some out for tile repair) over the past 9 months. Yet the results of the test are always the same.
Mostly, the number is not in the range that the "Pool Math" says it should be. Do I need to be concerned about it?