Abstract: Disclosed is an apparatus for collecting and reusing substantially all of the gray water from a source such as a household washing machine without modifications to a building or residence, or the washing machine. The apparatus includes a tank for receiving the water; a pump for pumping the water out of the tank; an activator for activating the pump when the water reaches a predetermined first level in the tank; a deactivator for deactivating the pump when the water falls to a predetermined second level in the tank; and a filter that is preferably formed of a complete pair of stretch pantyhose for filtering lint from the water. A ring clamp holds the filter proximate a filter inlet, the filter extending downwardly within the tank from the ring clamp. Disk members are provided within foot portions of the filter for preventing entry of the filter into the pump.