My cya is high. I'm having trouble getting an accurate read on it but my latest reading shows 100. Last season it was 120 by my reading (but I was even newer at it then). The local pool store tells me it's 40 but my chlorine level was over there equipment max level of 10. Watching the water from last season and this season it seems that I have to keep the chlorine level high to compensate for the high cya so I don't trust the pool store reading. I'm going to try and have them retest tomorrow since my chlorine has dropped to 8 (2.5 drop in one day, is that normal?)
The big question is should I dump and refill? The pool calculator tells me I need to dump 2/3 of the water assuming it's pure (it could happen hehe) I need to test the city water, the pool store tells me there is a lot of metals in the city water, will that be difficult to clean out.
My latest readings are:
pH 7.9 (going to add acid)