CYA and Lifetime of Chlorine

[mas985]

I was planning on slowly raising my CYA from 30 ppm to 80 ppm but to take advantage of solar, I am running my pump during the day.

One thought though is that pools with solar covers should have a considerable sheilding effect of UV. Experiencing an increase in production with a solar cover may indicate the same thing as doing the test overnight.

Another way to perform a shorter test would be to put the SWG into spa mode and run for a measured period of time. This would make it easier to test the chlorine levels since they should be higher and the test could be done in a much shorter period of time.

[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