I completed my owner/build pool last summer and had little issue with the water chemistry (did not check CYA at pool start up nor during summer). Now this summer (hot summers in Arizona) I've been going thru a lot more 3" stabilized chlorine tablets than I did last summer and pool has had light green tint to it. My chlorine level would dip under 3.0 and I'd add a gallon of liquid Chlorine (from local pool supply). Several times it would require 2-3 gallons to get the pool clear with pump running overnight. In trying to get the root of the water problem I thought maybe it was the phosphate levels. I had that checked a few times and it was close to zero. Last I thought maybe the stabilizer (CYA) was too low and my chlorine was burning off faster than it could work. So I took sample to pool store and they tell my my CYA is around 110ppm. Reading the threads on TFP I know thats not a good thing and it explains why I've been struggling with a light green pool most of the summer.
First question, how did the CYA get that high? I do realize and its a lesson learned, without a reading at fresh pool water start up I dont know where I started. Is it possible my pool start up guy put too much stabilizer in the pool? Or would going thru six 3" tablets a week cause this?
Second question: I know draining my pool is the only way to lower CYA, but do I need to drain the whole pool or just some of the water? 20x40 rectangular pool, 3x5x3 depth around 24,000 gallons.
Thank you!
First question, how did the CYA get that high? I do realize and its a lesson learned, without a reading at fresh pool water start up I dont know where I started. Is it possible my pool start up guy put too much stabilizer in the pool? Or would going thru six 3" tablets a week cause this?
Second question: I know draining my pool is the only way to lower CYA, but do I need to drain the whole pool or just some of the water? 20x40 rectangular pool, 3x5x3 depth around 24,000 gallons.
Thank you!