CYA and Lifetime of Chlorine

[chem geek]

Mark,

Agreed. The spa mode sounds like a much faster way to test for the SWG efficiency effect (either at night or with a UV-shielding cover) since the volume of water is much smaller. I'd hate for you to increase your CYA level in your pool only to find out that you may want to dilute it, but we already know that most high-CYA (70-80 ppm) SWG pools can run fine at lower FC (most are at 3 ppm) though some need to run closer to 5 ppm.

Running the SWG at night or with a cover should have the FC rise (rather than be maintained) so it will be any difference in the rate of rise (if any) that is what we are looking for.

Thanks,
Richard