초록 ▼

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 co

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.

대표청구항 ▼

A reverse osmosis unit for a purification system, comprising: a unit housing formed as a generally open-ended cylinder and a housing cap defining a feed water inflow port, a purified water outlet port, and a reject water outlet port, said cylinder and cap including means for removable interconnectio

A reverse osmosis unit for a purification system, comprising: a unit housing formed as a generally open-ended cylinder and a housing cap defining a feed water inflow port, a purified water outlet port, and a reject water outlet port, said cylinder and cap including means for removable interconnection to define a generally hollow interior; and a dual stage filter cartridge for drop-in mounting into the interior of said housing, said cartridge including a first filter stage having a selected filter media, a second filter stage including a reverse osmosis membrane for separating water into a relatively purified water supply and a relatively impure reject water supply, means for connecting said feed water inflow port to said cartridge for series passage flow of water from said inflow port through said first and second filter stages, means for coupling the purified water supply to said purified water outlet port, and means for coupling said reject water supply to said reject water outlet port, said first and second filter stages being interconnected to provide a unitary cartridge.