Reverse osmosis is a filtration method for water purification that uses a tightly wound, semi-permeable membrane to remove dissolved contaminants. The application of pressure before the membrane causes the fluid to travel from a region of high solute concentration to a region of low solute concentration to overcome the natural osmotic pressure and redirect dissolved contaminants which result in fine filtration of water. The water flows from the outside layers of the membrane toward the inner layers. The contaminated water gets pushed and exits the membrane on the opposite side of the incoming water as the pure water continues through the layers toward the center of permeate tube.  The separation and removal of micro-contaminants take place as the fluid spirals through the various tightly wound layers of the membrane and into the inner permeate tube collecting all the purified water (permeate) for use.  The rejected water with contaminants (concentrate) flows perpendicular to and out of the backside of the membrane. It can efficiently perform straining or size-reduction of the contaminants of size 0.001 microns in diameter