Test strips: Cautionary tale

[EJEJ]

Old test strip, dated 2012 (on the left), and new test strip dated 2015 dipped together. The bottle matches the new test strip. Note especially how far off the Free Chlorine and CYA measurements are. Yikes.

 

[jblizzle]

We do not recommend even using NEW test strips .... get one of the Recommended Test Kits and throw those away.

Unless you are able to differentiate the FC within 0.5ppm (up to 20-30ppm if a SLAM is needed), the TA within 10ppm and the CYA within 10ppm based on those colors.

And where are the CC and CH readings?

 

[EJEJ]

I know now that the test strips aren't a good idea. I'm just providing another reason to get a good test kit.