PH and ORP Probe Cleaning (and Storage) solution - cheaper alternatives to Milwaukee

[Alexander1312]

I need to clean and refresh my ORP probes weekly now as they seem to fall out of calibration after about a week. The reason could be likely due to their placement right next to where the dosers are, but not sure. Therefore, I am looking for cheaper options due to higher usage.

Same with the storage solution, but I am not sure what is inside their bottles as it is not shown.

https://milwaukeeinstruments.com/milwaukee-ma9016-cleaning-solution-for-ph-/-orp-electrodes/

 

[PjFish]

You need to calibrate every week? Wow
Following since I just ordered new Milwaukee probes a few days ago and this solution which have never used before

 

[Alexander1312]

You need to calibrate every week? Wow
Following since I just ordered new Milwaukee probes a few days ago and this solution which have never used before

ORP only. PH once every 5 weeks and they still stay more or less in calibration. I am only using Milwaukee probes.

 

[JVU]

Why? The absolute value reading of an ORP probe is meaningless as far as I know. Even the trends of it going up and down, though consistent, don’t seem to be useful in my experience. I don’t think I’ve ever calibrated mine and it does it’s thing, going up and down inverse to pH (or maybe lighting), goes down when I do a water change, and otherwise creeps up. I can’t imagine a scenario in which it changes to some specific number and that makes me do something with my tank.

 

[Alexander1312]

Why? The absolute value reading of an ORP probe is meaningless as far as I know. Even the trends of it going up and down, though consistent, don’t seem to be useful in my experience. I don’t think I’ve ever calibrated mine and it does it’s thing, going up and down inverse to pH (or maybe lighting), goes down when I do a water change, and otherwise creeps up. I can’t imagine a scenario in which it changes to some specific number and that makes me do something with my tank.

I am using Ozone, so this is the best available way to not overdose. In line with RHF’s paper, I am staying closer to the lower-end values of around 300mv, after which the generator turns off. I calibrate them every month and the calibration stays stable after they have been cleaned. ORP probes are not useful if you are not using Ozone. I do not see the inverse relationship to PH you are describing.