2012/2/1 · The PTFE membrane was used above 100 C and upto 3 atm gauge pressure in the setup designed for the higher temperature/higher pressure DCMD experiments. Hot 1% NaCl solution was pumped over one side of the membrane at 500 ml/min; the permeate side of the membrane was exposed to cold distilled water at a flow rate of around 500 ml/min at temperatures of 25 °C to 30 °C.