Do pool or spa water samples have to be at "room temperature" before testing begins?
With one exception, no. Our lab has run the pH, total alkalinity, calcium hardness, free chlorine, and cyanuric acid tests on known standard solutions at approximately 104°F, 75°F, 60°F, and 40°F. Only at 40°F did the CYA standard solution test higher than its actual value (after accounting for test variability). All other tests were unaffected by temperature differences.
Easy question. I'm opening this weekend to avoid any algae (porus loop-loc cover). What are the effects of cooler water on CYA test - does it read low or high? Being precipitate based I would assume it would read high as there would be more precipitate sooner. Secondly I guess if I bring the...
I get a substantially higher reading when the water is cold. My last test one month ago with water temp 80 was 50 and I have not added any CYA since then but did backwash/re-fill which would have dropped the level. Today I ran a test at water temp 54 and it was 70. I knew that was way too high based on the prior test so I ran another test after letting the water warm up. That test was 40 which was what I expected.