Bruce what your computer program doesn't know is that the pumps on my 150gph shiny squeezer are the same as on a 400gph shiny squeezer. With a conventional NF 90 membrane I can't get the flow rates that I can with the NF 270 high flow membrane. With the NF 270 membrane I am able to use every bit of flow that the pumps will produce which is just under 4gpm on the concentrate and permeate sides or close to 8gpm total or about 400gph. It will maintain those flows for about 2 hours before it starts to slow down as the concentrate gets into double digits.