I'm currently at 65-70 CYA level after doing a 1/3 drain and refill.
is 65-70 CYA managable? would gradually get reduced by splash and backwashing. or do i need to do another 1/3 drain and refill?
recommended level for CYA is 30-50
so what is the optimal CYA level? what does everyone keeps there's at exactly? should make a poll or something.
I now use liquid chlorine/bleach