The waste water pumping system type AH-300 is a lifting system to deliver clear water (fresh water), condensate from condensing boilers with a pH value of > pH 3 as well as slightly polluted water. The condensate is directed to the drain via a level-controlled pump. The pump itself is protected from severe impurities by means of the integrated filter cage. The built-in non-return valve prevents the media from flowing back. Furthermore, the waste water pumping system AH-300 is suitable for continuous operation.