Quote Originally Posted by giroup01 View Post
That's the simple explanation.
That's actually a great explanation, thank you. So a friend has been feeding his vinyl pool trichlor for years. His CYA is over 100. I've told him to keep his chlorine high, but to only use bleach. Will this damage his liner (I have a plaster pool so I don't know)? How long will it take to get it down to more reasonable levels?

Thanks!