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Nimbus Water Systems has been in business for over 40 years, after introducing the first successful residential reverse osmosis water purification system. Today, Nimbus produces the smallest faucet-mounted reverse osmosis system available: the Watermaker Mini. The Watermaker Mini has been tested and certified under ANSI/NSF Standard 58 for reduction of TDS, cysts, and lead. We offer a full line of Nimbus reverse osmosis water systems, replacement membranes, and Nimbus water filters. Our water filters, both prefilters and postfilters, as well as Nimbus RO membranes are designed to be used with water purification systems such as Cascade Drinking Water System and the CS systems.