Abstract: A water purifier that can be placed between an upper canister and a lower canister. The upper canister may include filters. Unfiltered water placed in the upper canister drains by gravity through the filters and water purifier into the lower canister. The water purifier includes a dispenser, a purifying media, and an indicator. Filtered, but unpurified, water passes from the upper canister into the water purifier, which houses the dispenser in which a material containing a chlorine and/or bromine compound is located. As water contacts the material, halogen is eluted to the filtered water. The purifying media contacts the unpurified water with halogen. The purifying media binds with the halogen, thereby maintaining the activity of the purifying media to purify the unpurified water. The water purifier may include an indicator to indicate when the material needs replacing.