| 摘要 |
A filter apparatus for a home reverse osmosis water system is provided. The apparatus has a head, which has a forward flow inlet port for connection to a reverse osmosis water unit, and which has a reverse flow outlet port for connection to a water service faucet. The apparatus also has a cartridge, which has a twist-on securing means for connection to the head, a filter assembly for filtering forward fluid flow and for filtering reverse fluid flow, and a combination inlet and outlet port for connection to a pressurized water tank. The filter assembly has a primary filter unit, which is disposed in a cartridge primary chamber, and a secondary filter unit, which is disposed in a cartridge secondary chamber, and a valve means, e.g., check valve, which is disposed between the primary chamber and the secondary chamber, whereby forward fluid flow is permitted to flow through the primary filter unit and also through the secondary filter unit, and reverse fluid flow is only permitted to flow through the secondary filter unit. The foregoing apparatus enables permeate from a reverse osmosis module to pass through the filtration cartridge, first through the primary and then the secondary filter unit, and after storage of the filtrate therefrom, passing the stored filtrate through the secondary filter unit of the filtration cartridge in a reverse direction to the direction the permeate passed through the unit, to filter the water just prior to use.
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