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Nanofiltration follows a concept similar to reverse osmosis. The main difference lies on the size of the pores, with nanofiltration membranes having 0.01 to 0.001 micron-pores while that of reverse osmosis membranes having 0.001 to 0.0001 micron-pores. In application, nanofiltration is used to remove hardness and organic pollutants in water.

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