CYA Question....

[CToon]

I would recommend starting out on the lower side. CYA can always be increased easily enough , while its not as easy to lower.

Plus , Its a Catch-22 type of thing going on. High CYA makes it easier to maintain CL levels , but higher levels of CL are needed for HIgh CYA. its anuff to make ya nuts I tell ya.

So try it low , if you find it too hard to maintain proper CL levels , bump it up a notch

[chem geek]

And don't forget to add chlorine right away to the water as you add it to the pool. That was probably assumed given that you were thinking of adding CYA right away, but I just want to make sure I mention it. Many municpal utilities have switched to using monochloramine instead of regular chlorine for disinfection. And yes, that means that one of the first things you may need to do after you fill up the pool is to shock it with lots of chlorine (exposing it to sunlight will also help break down the monochloramine).

Richard