In boats without natural fall from shower tray or washbasin into the holding tank the VETUS grey water discharge system takes over this function. In many boats it is impossible to achieve a natural fall from the shower tray or washbasin outlet into the waste water tank. In these cases the VETUS grey water discharge system (GWDS) is the answer. The GWDS consists of a watertight housing with a discharge pump and automatic float switch. The pump produces very low noise. A non-return valve is fitted in the discharge line. The bottom of the GWDS assembly must be at least 6 cm below the shower tray or washbasin outlet. The waste water tank can be located up to 4 metres above the GWDS unit or up to 20 metres away from it. Instead of pumping the waste water into the holding tank it can of course also be discharged directly overboard. If the system becomes clogged the housing cover can be easily removed to clear the blockage.