I've read somewhere in the past that too large an air pump will cause the w/f recirc. setup to not recirc....

I went with Xtra Crispi's idea for gettin' them to recirc. and like it that way better, cuz I can just close the valves on the res and pump everything in the system back to the res for testing or res changes...

When I'm ready to gettin it recircin' again just open the valves and gravity fills the system, simplicity
d4twamp Reviewed by d4twamp 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