Just got my Geo, Think im missing a piece

[AQUAH0LIC]

Hey guys. I just got my Geo reactor today and I am very impressed with the quality to say the least. But i have a question. There is a black screw on top of the Lid with a hole in it. what is this for? If i turn the reactor on water is going to come out of it. I dont get it. Need some guidance.

Doug

[Phishy]

Hello Doug. You got the newest model! That is where the pH probe will go into. The older style models required you to measure the effulent pH at the out put tube. Now, you can measure the pH inside the reactor. Much nicer this way. Let me know if you have any other questions.
Phishy