Pressure forces water through the reverse osmosis spiral bound membrane and because water molecules are so small they will pass through while leaving any impurities behind.
Unlike conventional filters that trap and store impurities water the waterlight reverse osmosis filter flushes them away thus continually cleaning the membrane surface and preventing contaminants. This is the reason why the reverse osmosis filter membrane can last so long and perform like new even after years of operation.

The waterlight reverse osmosis system is the most efficient and cost effective way to render water to ite most purified state. The principle difference between a reverse osmosis filter and other methods of filtration is the ro filter' semi-permeable membrane. The waterlight  reverse osmosis filter membrane has the smallest pore size of any filter at 0.0001 microns.