I am fairly new to owning a pool, this is our second summer. Last summer our pool was blue all summer, this year we can not get rid of a clear green pool color. I was told my pH is 7.0 and my CYA is 100. Is there a way to bring down my CYA without draining my pool? It is a 18000 gallon pool, white plaster. with a spa. If I do have to drain it how much do i need to drain? I need to find this out before i spend a lot of money in chemicals to yield no results. Thanks
[Edit:split/renamed:Butterfly]
[Edit:split/renamed:Butterfly]