cya zero


LifeTime Supporter
May 23, 2009
Trenton NJ
I just opened my pool. It looks like shrek's swamp. I test cya and it is zero or so low it is not showing up on test. What would be my shock when its this low? The lowest number on cya/chlorine chart is 60

Bama Rambler

Mod Squad
TFP Expert
Bronze Supporter
LifeTime Supporter
Jun 22, 2009
SouthWest Alabama
Shock level for zero CYA is 10 ppm FC. Don't be surprised if your CYA converted into ammonia and you'll need tons of chlorine to get rid of it.