Safely eliminate and prevent mold/mildew odor and all other foul odor in enclosed areas with this slow-release odor control system. Ideal for long-term storage and vessel winterization, it utilizes cutting-edge NosGUARD SG chlorine dioxide technology to create a deep penetrating vapor. It begins to work immediately, lasts up to three months and can be used in occupied boats or homes for continuous odor control. Handy twin pack contains two 10g packages. Each 10g package treats up to 1,000cu.ft.