Randy Holmes-Farley
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My Tank Thread
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- Sep 5, 2014
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So, for a few months, my ORP has sat in a range from about 240-270. I tried cleaning the probe in vinegar and the ORP went up to the high end of that range, but still stayed there. Just to see where my probe was reading, I purchased some 400 ORP solution. Immediately after putting the probe in, it went to about 390, and then slowly ticked upward to about 396 after about half an hour. So, somewhat sad that the probe was reading properly, I put it back in the tank.
It went back to 270. AND THEN...it started slowly trending up. No other changes to the tank. As of this morning (12 hours later), it is about to break 300 (and doesn't seem to be leveling off). Maybe my probe was "stuck" in place somehow? I'm not sure how else to explain it.
ORP probes in seawater can take a very long time to come into equilibrium with organics and such the are binding to the metal surface.