I just set up my pool yesterday and refilled with new water last night. This morning i perform a balance test, and as expected the pH is high, but what surprises me is the CYA is already around 30 without having added any chemicals yet. Am i incorrect in expecting CYA to be "0" with new water? Or should it have SOME CYA already in it? Last season was my 1st season ever of having a pool and i did OK and i have this site to thank for all the info ive learned here, not to mention the fun im having from actually doing the maintenance. Up until around September last year my water was sparkling clean, and thats when i learned about CYA /Chlorine relationships, so now im really critical to monitor that and im ready for another season, but this time armed with more knowledge