A portable dechlorinator filter, primarily designed for use in dechlorinating the water in a bath tub or the like, is in the form of a hollow ball made of plastic material. The plastic ball includes a number of perforations or apertures through it to permit the free flow of water from the exterior of the ball through its interior. Filter material made of a copper-zinc compound or brass-zinc compound is provided in the form of elongated filaments (manufactured on the order of steel wool and the like). The filter material is encased in a water-permeable, gauze-like cover placed inside the plastic ball. The gauze-like cover prevents broken ends of the filaments from protruding through any of the holes in the ball. The ball is made of two releasably interconnected hemispheres; so that spent filter material can be removed and replaced with new filter material.