ORP slowly rising without any particular reasons

[kevensquint]

Hello, so I installed a Milwaukee ORP controller on my reef about a month ago. It took 3 days to settle with a reading of about 250. At that point I dosed Ozone once for an hour . It bumped up to 280 and the next day settled at 260. A week later I did another try of Ozone for an hour. It bumped up to 300 the the next day settled at 265. For the past 2 weeks I not added Ozone or anything and it's slowly been creeping upward. The ORP controller reads 351 this morning. Is this a concern ? I'm wondering if something is causing this which could make it continue upward to a dangerous level for the reef inhabitants I have. Thank you

 

[CasperOe]

Hello, so I installed a Milwaukee ORP controller on my reef about a month ago. It took 3 days to settle with a reading of about 250. At that point I dosed Ozone once for an hour . It bumped up to 280 and the next day settled at 260. A week later I did another try of Ozone for an hour. It bumped up to 300 the the next day settled at 265. For the past 2 weeks I not added Ozone or anything and it's slowly been creeping upward. The ORP controller reads 351 this morning. Is this a concern ? I'm wondering if something is causing this which could make it continue upward to a dangerous level for the reef inhabitants I have. Thank you

Nope, no concern at all - unless you have reason to from observation? :) Just enjoy not having to do anything about it - and don't think about the number!

As you leave your tank to do it's thing, your filtration takes care of the rest. That's why you see a slight increase in ORP. Don't worry about it!

Try do a water change, and you will see your ORP dropping! Then, slowly it will go up again!

 

[Reefer Matt]

Hello, so I installed a Milwaukee ORP controller on my reef about a month ago. It took 3 days to settle with a reading of about 250. At that point I dosed Ozone once for an hour . It bumped up to 280 and the next day settled at 260. A week later I did another try of Ozone for an hour. It bumped up to 300 the the next day settled at 265. For the past 2 weeks I not added Ozone or anything and it's slowly been creeping upward. The ORP controller reads 351 this morning. Is this a concern ? I'm wondering if something is causing this which could make it continue upward to a dangerous level for the reef inhabitants I have. Thank you

Is there a concern with the tank that warrants an orp controller? Or just a personal preference?

 

[taricha]

The OP is using ozone, and in that case I would want orp monitoring.

 

[Randy Holmes-Farley Verified Community Expert]

Algae on the ORP probe can cause measurements to rise.