Please forgive my ignorance in advance. I have been reading through the forums and I haven't figured this out yet and I can't find it in any of the pool school stuff. Where does CYA come from? How does it get into the pool?
I know you can add it to the pool, but if you aren't adding anything, where does it come from? I have read so many threads that say you will have to drain and refill or you will need basically a tanker full of chlorine to combat it-is this a naturally occurring substance?
The only way to combat the CYA is to add chlorine? Correct?
Thanks in advance for humoring me