you need a pressure pump and feed pump in order to get above 10%. smaller rigs have a hard time getting past 8% even with many passes, usually more than 2 passes results in plugged membranes. you're in the middle of efficiency and economics at that tap count. best to get a good used rig that does 12-15% in a pass and settle for less gph.
Fred Ahrens
330-206-1606
Richards Ohio Maple Equipment
Ohio CDL sales rep
LaPierre Dealer
H&M maple fabricator Dealer
Service Tech/repair for all brands and electronics
don't take life too serious, nobody gets out alive anyways!