Helps to keep our waterways cleanThis system can be easily fitted to a bilge pump discharge line to filter all gas, oil, diesel and other hydrocarbons from your bilge water without creating back pressure or reducing water flow. Each system includes a patented Mycelx filter, a filter housing and a Smartpad. The BilgeKleen system is available in three packages with different filter sizes and features: BK-1 includes a mounting bracket and fittings to accommodate 1/2", 3/4", and 1" hose and one filter; BK-2 includes a mounting bracket and one filter; and BK-3 includes a mounting bracket, wrench and one filter. Patented Mycelex filter absorbs petrochemicals Does not create back pressure or reduce water flow