Abstract: A device for treating and conditioning engine coolant for use with an internal combustion engine includes a housing having an inlet and outlet and a filtering media and container carrying coolant treatment material located within the housing. Coolant passes through the filter, and then is exposed to the tip of a rod which erodes away to permit treatment material to be discharged in the coolant. As the corrosiveness of the coolant decreases, erosion of the rod is discontinued, so that additional treatment material is no longer discharged into the coolant. Accordingly, the corrosiveness of the coolant is controlled to within relatively narrow limits.

Abstract: A filter/conditioner for filtering and dispensing conditioners and inhibitors to the engine coolant of an internal combustion engine includes a circumferentially extending array of filtering media circumscribing a container defining a compartment which contains a coolant softener/conditioner and a rust inhibitor pellet which dissolves to release rust inhibitor into the coolant. A diamond design is embossed on the outer circumferential surface of the container, so that grooves provided to permit coolant to travel to one of the ends of the container, and then through the container where the coolant is treated.