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Patent drawing for Under the counter water treatment system
US 6,358,395 B1
Water treatment US 6,358,395 B1 Expired

Under the counter water treatment system

This invention describes an under-the-counter system for purifying water from an outside source. It first uses a filter to remove sediment and other pollutants, then pushes the water through a reverse osmosis membrane to remove very small impurities, storing the highly purified water in a tank. An optional final filter cleans the water before it reaches your tap. The claims specifically cover this sequence of a pre-filter, reverse osmosis membrane, and a storage tank.

Why it matters: Since 2000, reverse osmosis technology for home use has become significantly more efficient, compact, and affordable, making such multi-stage filtration systems more accessible. Modern systems also often integrate smart monitoring for filter life and water quality, which was less common at the time of filing.

Status
ExpiredProtection ended and was never renewed
How hard to build
ModerateReverse osmosis membrane, pump, pressure vessel.

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