Thuwad, check on the photos in post # 26 and 27. shows the inside perfectly; next post shows same sytem filled with water and running. See if those work for you because that's exactly the photos I would take again

Your problem in understanding, I thiink, is the your lack of your central res....you don't need the float and all that.....with 4 w/fs I'd go with a 30 or 40 gal rubbermaid to hellp with keeping the solution stable as a central rez. Also if you buy the upgrad kit you get everything you need....for a price If you piecemeal it start with buying an exra pumping colum and drip ring.
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