Reverse osmosis

==== Military ====
Larger scale reverse osmosis water purification units (ROWPU) exist for military use. These have been adopted by the [[United States armed forces]] and the [[Canadian Forces]]. Some models are [[Containerization|containerized]], some are trailers, and some are themselves vehicles.{{citation needed|date=March 2015}}

The water is treated with a [[polymer]] to initiate [[coagulation]]. Next, it is run through a multi-media filter where it undergoes primary treatment, removing [[turbidity]]. It is then pumped through a cartridge filter which is usually spiral-wound cotton. This process strips any particles larger than 5 [[micrometre|µm]] and eliminates almost all turbidity.

The clarified water is then fed through a high-pressure piston pump into a series of RO vessels. 90.00–99.98% of the raw water's [[total dissolved solids]] are removed and military standards require that the result have no more than 1000–1500 [[parts per million]] by measure of [[electrical conductivity]]. It is then disinfected with [[chlorine]].{{citation needed|date=February 2016}}