Dual stage filter cartridge for a reverse osmosis purification system
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United States of America Patent
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Aug 6, 1991
Grant Date -
N/A
app pub date -
Oct 13, 1989
filing date -
Oct 13, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A dual stage filter cartridge is provided for use in a reverse osmosis water purification system or the like. The filter cartridge includes a first stage having a filter medium for removing selected contaminants from incoming feed water, and a second stage including a reverse osmosis membrane for converting a portion of the filtered feed water to a relatively purified water supply. The filter media in the first state is particularly selected to remove contaminants which are otherwise potentially harmful to the reverse osmosis membrane. The dual stage cartridge is configured as a single unit adapted for simple drop-in installation into an open-ended cartridge housing.
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