So I recently purchased a new Apex (full model). I had a brand new Neptune standard pH probe I had gotten from someone recently who did not have a use for the extra probe that came with their Apex. Initially worked fine, then all of a sudden, two days in, the pH readings jumped from 8.3 to 8.9, and stayed in the 8.9-9.0 range for several days, but everything in the tank was alive and well.
So I decided to recalibrate the probe. But I also chose to calibrate the probe that came with my Apex also so they can run side-by-side in case this were to happen again.
The problem is, my recalibrated probe is reading 8.2, while the newly calibrated probe is reading 8.66. I recalibrated both probes another two times, and it's still reading the same.
When the water is tested to a test kit, i'm getting around 8.3. Could the probe that came with my Apex be defective? Both are standard grade probes.
I'm going to let both sit in the water for a few days to see if I get a sudden jump like I did when I first set it up.
So I decided to recalibrate the probe. But I also chose to calibrate the probe that came with my Apex also so they can run side-by-side in case this were to happen again.
The problem is, my recalibrated probe is reading 8.2, while the newly calibrated probe is reading 8.66. I recalibrated both probes another two times, and it's still reading the same.
When the water is tested to a test kit, i'm getting around 8.3. Could the probe that came with my Apex be defective? Both are standard grade probes.
I'm going to let both sit in the water for a few days to see if I get a sudden jump like I did when I first set it up.