New controller arrived today but i don't have the time to get it up and running. But i manage to hook up the ORP controller and calibrate the probe. My tank ORP look pretty low. It is around 265
In my experience, it may take 6-7 days for the ORP probe to start delivering accurate readings... you might look at re-calibrating before starting a dosing regimen...
My ORP probe (connected to an Apex) started reading in the 150 range... after a week, it was rock solid between 380-390. It was calibrated at the factory, so I didn't re-calibrate when I received it...
Just a thought.
LL