Brian- What exactly do you have for high pressure pumps on your machine now? Im thinking about adding an extra high pressure pump on each of my machines and then hooking both machines together so all the flow goes through all four posts. Then Id have like one 2400 gallon machine that I may be able to single pass to a flow of maybe 6 gallons per minute of 12%? Im just wondering how many hp and gpm I need per machine to match what yours is doing. Thad- How are you getting the higher concentate? Are you recircing a while first? Theron