ORP probe question

[LSCondos]

I have no idea why ORP readings are so low. Rola-Chem Gold ORP probe was replaced on May 10, 2017, but for the last 2 weeks numbers way down.

Wed. 9am
ORP 180
FC 11.2
CC .0
Alk 80
Ph 7.4
CYA 70
Salt 4000

So I turned off the cells at controller.

Thur 9am
ORP 195
FC 10.4
CC .0
Alk 80
Ph7.4
CYA 70
Salt 4000

This morning @ 9am
ORP 175
FC 9.0
CC .0
Alk 70
Ph 7.3
CYA 60
Salt 4000

Why is the ORP #'s not reflecting the chlorine #'s? Can a probe be "burnt out"? When I returned from vacation 4 weeks ago, I found the cells plugged into outlet instead of controller, meaning 3 cells running 24/7. FC was 16. Today I ordered another probe, just to be safe. A PB friend told me the cells out "gased" the pool, is there articles i can read on this, or is this a possibility? I have not turned the cells on as of typing.

 

[mknauss]

Others will chime in but it is my understanding that ORP does not work in the long run with CYA above about 20 ppm.

Hope you get some answers.

Take care.

 

[Bama Rambler]

You could have a failed probe, but we've seen lots of reports where ORP worked until it didn't in pools with CYA levels above 20 or 30 ppm. We're not sure where the interference comes from, but it's frustrating once you start having problems.

Hopefully yours is just a bad probe.