Determining flow through the membrane

For dialysis membranes the Lp was determined to be 6.34*10^-7 cm min^-1 mmHg-1 . A cylindrical hole 1 cm in diameter was cut in tow lexan pieces that were then bolted together with the membrane between. Fluid entered one side through a pump and a pressure transducer was affixed. the flow was adjusted until the pressure (above atmospheric) was 20000 pascals. the pressure on the opposite side was atmospheric (zero). assume steady state flow. what was the flow through the membrane?