I have been monitoring CH for a few weeks and am consistently getting 175. This is really unusual as we live in a very hard water area (lots of limestone). I think the CH was low before we entered this recent rainy season. I can't even buy calcium at a pool store here bc no one has low CH levels!
Any thoughts or suggestions?
pH 7.8 (lowering now with MA)
FC 16 (I am shocking due to recent rain and pollen dump in my pool)