I would like to know how long I should wait after adding chemicals (chlorine, CYA, Muratic Acid, etc.) before testing again for those items.

I have a 20,000 gallon gunite pool. If I add CYA Stabalizer to increase from 40ppm to 60ppm how long after adding it will the test results acturately reflect the new levels? I've heard to wait anywhere from 24 hours to 3 days (with pump running continuously).

What about when I add Muratic Acid to lower the PH. How long before I should retest to verify the change?

Thanks,
mike