I realize my CYA is high (150ppm) and will drain pool after our guests leave. I use the pool calculator to determine how much liquid chlorine to add daily. I use a desired FC value of 15. Evey morning I test and results are ~ 11-12ppm. Is that a 3-4ppm a concisderable amount to lose, or nothing to worry about?
I can't wait to drain the pool and bring CYA down to use a lot less chlorine.