How long can you wait after getting sample before testing?

[another one]

I tried searching for this answer, but "wait" gets lots of hits.

So my pool water is cold - 63 degrees, and I want to let it warm up for about 4 to 8 hours so I can test CYA. So can I just wait and test everything or do I have to test pH, FC, etc. now and CYA later?

Also, can you wait days before testing - like mail a sample to someone and have them do a test?

Thanks as always.

 

[frustratedpoolmom]

No, you have to do the test fairly quickly.

To warm up the CYA sample just run the bottle under warm/hot water.

 

[benavidescj]

What is the reason for warming the sample?

 

[chem geek]

To speed up the rate at which it forms the cloudy precipitate so that measuring after 30 seconds of mixing gives you a reasonably accurate result.

 

[Richard320]

I don't think CYA will be affected by waiting, it's there or it isn't. pH will change with time. Try it yourself: take the reading as soon as you draw the sample. Then set the color block aside while you do the rest. See if it didn't move a little. Shake it up good, it will definately change. But I digress. Chlorine will dissipate with heat, sunlight, and air. So it should also be done fast. CYA endures. Oh, how I wish it would disappear on its own......

 

[JasonLion]

FC, CC, and PH can all change fairly quickly if you leave the sample sitting. TA, CH, CYA, Salt, Borate all stay more or less the same when the sample is left sitting.

 

[another one]

Thanks for all the info. I tested with fresh water and did the hot water bath to get it above 70 degrees. New pool heater showed up today, vent pipe is coming on Tuesday. So hopefully, we'll have a warm pool next week.