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Orp

TanksNStuff

TanksNStuff

Officer Emeritus
Officer Emeritus
Matt is correct. ORP is a good thing to monitor to have a baseline over time to see if you have drastic changes in your tank... but there are many things that affect it and it's difficult to categorize it into a specific parameter range as "normal".

For instance, the amount of oxygen (and more importantly, carbon dioxide) in your house can vary greatly from everyone else's due to the size of your house, air circulation equipment, and how much fresh air you allow into your house daily, how many people live there, how many plants you may have, etc. Then you have different chemical processes going on in your tank which will alter oxygen ratios as well.

It might be better for you to just read this article by Randy Holmes-Farley which can explain it much better than me: http://www.reefkeeping.com/issues/2004-05/rhf/index.php
 
jimroth

jimroth

It's hard to say exactly what the value is. I like it and use it. One example of the weirdness of ORP is, for example, when you do a big water change the ORP will go down and that's not a bad thing. Just means the oxidation potential is lower. Important to understand what you are seeing.
 
R

reefman

I always thought the ORP level normally around 365 is a good number to indicate the water is clean. Mine is around 300 and don't know how to get it higher.

Thanks
 
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