the first thing I would do is to grab some calibration fluid, a 7 and a 10 packet from whatever LFS is the closest and recalibrate your probes. A weird change in a monitored parameter without any physical change to the tank reeks of a probe going bad, or out of calibration. if it reads the two calbration fluid right, and you still have a spike, I would probably take it to someone else around yhou that has a probe and take a jar of water to them and see what their probe reads. IF it really did spike, there has to be something causing it. But i would confirm all reading before acting on it.
Well.... the probe just needed a good clean. The end somehow got stuffed bull of junk. I normally clean it every 3 months.... but apparently it was in dire need now. Thanks BMAC2.... good call!
excellent. the probes for ORP and for pH both are pretty damn touchy, I don't care what brand or how much you spend on them. They get dirty just a little bit and go nuts.
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