Abstract: A housing for a bilge pump-filter has a lower part in which oil and like light pollutants are separated from the polluted water. A pump has its intake connected to the lower region of this lower part and its output connected to an upper compartment of a compensation chamber in the upper housing part which is subdivided by a filter into this upper compartment and a lower compartment. A funnel under the filter conducts liquid coming down through the filter by gravity to the lower region of the lower compartment and a drain at the upper region of this lower compartment off the filter water. A level detector in the lower separation chamber operates the pump only when liquid level in this separation chamber is above a predetermined minimum level.

Abstract: A device for separating liquids of lower density than water, in particular oil, from water, comprises a pump and a separator receiving the liquids from the pump. The separator comprises a settling chamber and a filter pack arranged behind the latter. A line between the pump and the settling chamber feeds the liquids exclusively to the latter. The line includes a vent valve. An overflow opening device is provided between the settling chamber and the filter pack. A shut-off member is provided for closing the overflow opening in response to the thickness of the layer of liquid of lower density collected in the settling chamber.