So here’s the deal I remounted my Apex and moved my probe rack to a different spot in the sump I made sure the probes were submerged the whole time and that the cables did not come in contact with the water I reconnected all the probes and recalibrated my pH probe with 7 and 10 pH Solutions and got a reading that was off by .30 But steady so I submerged my pH probe in hand as all purpose probe cleaning solution and made sure there is no organic build up on the probe tip I recalibrate it again and again it was off.
I thought to myself obviously my buffering solution is bad so I went and bought new bottle of each I recalibrated it again and guess what that’s right it was up again at this point I bought a new pH probe from Neptune supplier but the probe came dry and was pretty old so I gave it back I bought a tunze Glass pH probe with BNC connection ( amazing quality ) calibrated it and got the same problem I am fed up and don’t know what to do any suggestions??
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