Although the idea of reversing osmosis has been known for over 40 years, the practical application only began recently. In 1962 the U.S Government funded the first Reverse Osmosis plant which processed 1000 gallons clean water per day. Today, there are more than 3000 large R.O. treatment plants, each producing more than a million gallons of drinking water each day. In 1991, the U.S. Army bought
8, 000 large membranes to their mobile water purification units for troops in Desert Storm. In 1993, the U.S. Government bought another 6, 300 large membranes to purify flood water in the Midwest.

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