okay so let me see if I understand this right.

In the main res (the big one) you have a drip column attached to the intake (which is coming from the individual WF units) and on top it is attached to an air pump which pushes the intake water out to either each individual WF or into the controler (this is the part which confuses me).

So then in each individual WF unit, you have a second drip column inserted but instead of attaching a ring you attach a line which goes back to the main res (which is what i referred to as the "intake" before)
slothy Reviewed by slothy 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