[Douglas]

I have a pH probe that came with my controller. It came with a "one time use" Ph callibration pouch, which i used to very first time.

I shut down for a while, and now i'm starting back up again. Is there a certain way to clean it first, and then re-calibrate it? I've seen several different types/levels of calibration fluids avalible. What is recomended? Can someone inform me on what to do?