ORP

[Rob Batten]

iv got an apex 2016 running my tank, so using the orp probe. I also run a uv and ozone through the skimmer, thing is no matter hat I do the orp never really changes its always around 260 mark. does this mean there is something going on in my tank that I don't know about?
iv checked the probe in 400mv solution and it reads 392mv so im assuming that the probe is working ok.

any input would be greatly received, im only concerned as Im running the ozone

 

[Randy Holmes-Farley Verified Community Expert]

I don’t think the goal is any particular ORP level. You did not see any rise at all when using ozone? ORP should also rise and fall day to night. Does it not?

 

[ca1ore]

How old is the probe? I recall mine taking a long time (weeks) to gradually climb into the mid 300s.