So here is the real brains of the whole operation and I could just KISS GH for thinking this up. It's a pumping column set up inside the rez that pulls the air in from the intake valve you set up and into the general rez.

We made one by adding an inch of 1/2 in tubing and an L extension to the bottom of the pumping column.....then cut the larger white tube down to approximately six inches (high enough to be above water level but low enough to stay inside the bucket) but we left the airline completely intact.

The third photo is a close up of both the one we made and the one that came with the GH kit.
Weedhound Reviewed by Weedhound on . GH WATERFARM USERS: SIMPLE RECIRCULATING SYSTEM Ok so I was at my hydro store yesterday and the BRAIN pulls out this kit from GH that makes your w/f set recirculating!! Ordinarily this isn't very exciting news EXCEPT...... Get ready.......:jointsmile: It uses an air pump and drip ring set up to move the water through the system. You do NOT NEED A WATER PUMP! Let me repeat that part: YOU DO NOT NEED A WATER PUMP. IT RUNS OFF A BASIC AIR PUMP. Rating: 5