At what temperature does the Taylor test results become invalid?

JamesW

TFP Expert
Mar 2, 2011
16,498
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.
 

ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
10,476
Northern NJ
A bit different conclusion then what is discussed here but either way it seems the CYA test water should be room temperature.

 

JamesW

TFP Expert
Mar 2, 2011
16,498
The reaction is slowed down by colder water, but as long as you wait the full mix time, the reaction should reach completion. Insufficient wait time can result in a lower than actual reading.

The solubility of the product of cyanuric acid and the reagent is reduced in colder water, which results in a higher than actual reading.

In any case, I don't think that the difference is that significant.

You can try it at both temperatures to compare if you want.
 

JamesW

TFP Expert
Mar 2, 2011
16,498
Note that water temperatures below 32 degrees Fahrenheit can cause test problems. Water should be above 32 degrees Fahrenheit before testing.
 

Rich D

Bronze Supporter
Aug 3, 2018
573
MA
Note that water temperatures below 32 degrees Fahrenheit can cause test problems. Water should be above 32 degrees Fahrenheit before testing.
I noticed that as well. For some reason my speedster stops spinning below 32 degrees Fahrenheit. ¯\_(ツ)_/¯
 

Newdude

Well-known member
Jun 16, 2019
1,094
NY
You could bring a sample indoors for te
For some reason my speedster stops spinning below 32 degrees Fahrenheit. ¯\_(ツ)_/¯
so do I. matter of fact I stop a lot of things at 32 degrees. So I go inside where I and my project (testing in this case). can warm up in a few minutes and work better.
 

Cedarpool

Member
Jun 14, 2015
17
Cedar Park, TX
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.