Seems like I forgot it all during the winter

[chuck9997]

I assume CA = CYA?

If so, I'd drain and refill first and THEN add CYA. Doing the other way round will waste a lot of cyanuric acid.

Ben

maybe I am reading this wrong.. but are you saying to drain the pool.. if the CYA reading is 5? I don't understand. Seems like a drastic move. but I am just a pool dummy.. so go figure.