Reverse Osmosis Water Purification Unit
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A Reverse Osmosis Water Purification Unit (ROWPU) is a portable, self-contained water treatment plant. Designed for military use, it can provide potable water from nearly any water source. There are many model ROWPUs in use by the United States Armed Forces. Some models are containerized, some are trailers and some are vehicles unto themselves.
Each branch of the United States Armed Forces has their own series of ROWPU models, but they all work basically the same way. The water is pumped from its raw source unto the ROWPU module, where it is first pre-treated with a polymer to initiate coagulation. Next, it is run through a multi-media filter where it undergoes ion exchange. It is then pumped through a cartridge filter which is usually spiral-wound cotton. This process clarifies the water of any particles larger than 5 micrometres.
The clarified water is then fed through a high-pressure piston pump into a series of vessels where it is subject to reverse osmosis. The product water is free of 99.98% of the raw water's Total Dissolved Solids (TDS) and by military standards, should have no more than 100 parts per million TDS by measure of electrical conductivity. It is then disinfected with chlorine and stored for later use.
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