False pH tests

[Katerific]

Ben,
I followed your instructions and got consistent results between 2 tests, in fact, my results were 7.8 and just 2 hours ago, I got 7.6 dipping the test cell down deep into the water (after rinsing the test cell about 4 or 5 times). What does this mean? Does the test cell and sample bottle need to be cleaned in this manner occasionally?

[PoolDoc]

You could have some slow-to-dissolve residue in the kit block. If you want, leave them both filled with distilled water after each use, for a couple of days, and they'll probably clean out OK.

[Katerific]

Thank you so much for your help. I appreciate it very much!

[PoolDoc]

You're welcome.