Originally Posted by
rkpetersen
Not just bubbles. I have recently had several recorded events where a pH probe suddenly dropped .3 units and then came back up in a minute or so, for no apparent reason. Thought the probe was maybe going bad. Then I had a chance to look at the probe during one of these events, and found a tiny snail crawling on the tip. Shook it off, pH immediately jumped back to normal. Has subsequently happened again (guess I need to clean out my sump). Possibly something similar going on with your conductivity probe.
Bookmarks