Depending on the nature of the feedwater, other equipment such as clarifiers or carbon filters may also be appropriate. With good pretreatment, the membrane in a crossflow machine will bear no burden greater than what's intended for it. The result is optimum performance and the lowest overall cost. Crossflow filtration provides unique separation and purification capabilities, particularly to reduce levels of small, dissolved impurities normally less than 0.1 micron in size. The crossflow process continually sweeps the membrane surface, minimizing buildup of rejected impurities to make membrane filtration processes cost effective.
Successful operation depends on good membrane selection, machine design and pretreatment.