False low PH?

Jul 9, 2018
90
Davenport, FL
Hi all, I’ve occasionally had some false low PH tests, and can’t figure it out.

I always do Chlorine first, then PH. Sometimes when I do PH I get a super low read, dump it out, rinse and do it again then it is more in line where it should be.

The only thing Hong I can think of is that I’m not really rinsing the tube fully from the chlorine enough, I’d like to think I do, but is the chlorine test powder or drops have a history of skewing PH?
 
You are correct. Any residual from the previous chlorine test will result in an incorrect pH test. Fully rinse the test tube after each test and before you store your kit.
 
Thread Status
Hello , This thread has been inactive for over 60 days. New postings here are unlikely to be seen or responded to by other members. For better visibility, consider Starting A New Thread.