ORP and Ozone question

[mrtint]

So I decided to go old school and run Ozone. Using one of the new avast reactors. Take looks incredible. Clarity is amazing and PAR is higher. SPS are living the light.
My question: is it normal for ORP to continue to raise even after ozone generator has been off for 4 days?

I currently have the generator turn on if ORP is 310 and off if ORP is 325. I only run Ozone during the day when my skimmer is on. My tank naturally rises at night anyway. Over the last 4 days my ORP has not fallen below the 310 mark to even turn the generator on. That doesn't really concern me. It's the fact that my ORP is now up to 360. I didn't want to raise that fast. It's gone from 280 (low) to 360 (high) over a weeks time
Things look really happy in tank but I am doing a water change today which will lower the ORP anyway.
I'm not overly concerned just curious if this is normal

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[Rafty]

I have a similar issue except my ozone kicks in under 400 however after only 2 hours of ozone running my ORP has been sitting between 430-450 and generally won't fall lower than that so ozone not kicking in at all.

Tanks looks really clean and phosphate/nitrates essential zero so not sure if that is the reason.


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[bertoni]

That's interesting. I am not sure what's happening. I wouldn't expect the ORP to continue to rise, but it is an odd water parameter. If the animals are doing well, I wouldn't worry.

 

[Greg 45]

What I have noticed with hobby grade orp probes is they tend to read on the high side when going bad. Also when I unplugged a cord from the power bar the reading would also change. I now run GF Signet probes and there controllers . Also when calibrating gf signet probes we add a quinhydrone to the ph buffers when calibrating them .

 

[slief]

What I have noticed with hobby grade orp probes is they tend to read on the high side when going bad. Also when I unplugged a cord from the power bar the reading would also change. I now run GF Signet probes and there controllers . Also when calibrating gf signet probes we add a quinhydrone to the ph buffers when calibrating them .

The Apex uses the same quinhydrone/ph mix for calibration as well but there is really no need to calibrate them since they should be replaced every couple years and if you clean them once in a blue moon, they should remain resonably consistent relative to their accuracy. That said, as you noted, I do think our hobby grade probes do tend to read high but for me, it's not the number that I am after but more the trends and in particualar a sudden drop would be what I'm looking for since I don't run ozone.

 

[Genetics]

My ORP probe needed to be cleaned once a week with a soak in vinegar for 10 minutes. Otherwise it would continue to rise without rhyme or reason.