Abstract: Described is a multi-function device for attachment to the tank of a toilet fixture. The multi-function device provides a diffusible air-treatment concentrate for deodorizing or otherwise treating the ambient air surrounding the toilet. At the same time, the multi-function device provides a water-soluble water-treatment concentrate for treating the flush water stored in the toilet tank. The device includes a connector with an air-treatment housing coupled to one end and a water-treatment housing coupled to the opposite end of the connector. The connector is configured such that the air-treatment housing, in which the air-treatment concentrate is disposed, is positioned adjacent the exterior surface of the toilet tank and the water-treatment housing, in which the water-treatment concentrate is disposed, is positioned adjacent the interior surface of the toilet tank below the fill-level of the tank.