orp

[btbeam]

I realize this might be a dumb question but with probes on controllers what is ORP? Thanks

 

[woodwrangler]

http://reefkeeping.com/issues/2003-12/rhf/feature/index.php

 

[luther1200]

Oxydation Reduction Potential. Its a complicated subject,IMO. That is a good article in the link.