Last year I had the problem of my CYA too high, and the bleach was basically locked, and wasn't killing the algae, so I had to do partial drain. Now this year, im battling low CYA levels. A few weeks ago my CY level was at 30, so I raised it up to 50, but after testing this weekend, its back down and below 30. Now we still don't have a lot of evaporation due to its still winter, and of course no losing of water by splashing, for we cant swim yet. I have not had to replace much water, only if I do a good minute or two backwashing and rinse...Why does the CYA go down so quick? I get nervous about adding too much stabilizer, only to not have to run into that problem of partial drain again. My levels are below before adding stabilizer..
FC 12
CYA 25
PH 7.5
ALK 120
Vinyl ABOVE GROUD POOL
FC 12
CYA 25
PH 7.5
ALK 120
Vinyl ABOVE GROUD POOL