Testing CYA

[aylad]

By bumping the CYA up just 10 ppm or so, you should be able to get an idea of whether it affects your chlorine loss or not. I can't explain the chemistry behind why the higher levels protect the chlorine better, I can only give you real-world experience gained from 8 years (and I mean year-round) of experimenting with my own pool.

Janet

[chem geek]

I higher CYA level should have your chlorine last longer, but you'll need to raise your target FC level according to Ben's Best Guess CYA chart. The only real problem with the higher CYA level is IF you let the chlorine get too low and algae starts to form, it takes a much higher chlorine level to get rid of the algae. So you really need to stay on top of your pool maintenance.