Calibrate ORP probe ?

<a href=showthread.php?s=&postid=10417700#post10417700 target=_blank>Originally posted</a> by chaffey
I turned up my 50mg ozonizer to max and set ORP at 400 mv, my reading is at 380mv...

should I go higher than 400mv for 200gal display plus about another 150gal sump/fuge/frag tank ?

No, water volume has nothing to do with the level, I will try keeping it at 375
 

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