Oase Aquamax pond pumps are a Filter & Watercourse pump. They are designed to cope with pumping high volume of water to a filter or waterfall. Aquamax pumps will pump debris from the bottom of the pond and pump it to your filter box where your filter will clean the water. The pump itself is not a filter and if you plan to filter the water it is best to use a compatable filter like the FiltoMatic.