Patent ID: 8388838

Claim:
A filter having a liquid additive for treating a fluid being filtered, comprising: a housing defining an inlet fluid opening and an outlet fluid opening, the inlet fluid opening and the outlet fluid opening defining a fluid path through the filter; a filter element disposed inside the filter housing, the filter element being disposed in the flow path such that fluid flowing through the flow path must pass through the filter element; a dispersement device disposed within the housing, the dispersement device comprising a housing having at least one chamber containing the liquid additive, the disbursement device further comprises a metering opening that is in fluid communication with the at least one chamber and is sealed with a heat dissolvable material that dissolves when heated by the fluid such that dissolution of the heat dissolvable material from the metering opening permits the liquid additive stored in the chamber to freely flow out through the metering opening and into the housing to cause the liquid additive to mix with the fluid being filtered at a predetermined metered rate, wherein the dispersement device further comprises a cap secured to the housing of the dispersement device, the cap being secured to the housing of the dispersement device after the liquid additive has been placed within the at least one chamber of the dispersement device, wherein the dispersement device is located between a base plate of the housing that defines the inlet fluid opening and the outlet fluid opening and an end cap of the filter element wherein the cap of the dispersement device is located adjacent to the end cap of the filter element.