| 摘要 |
An aquarium filtering system for gravity flow systems wherein a float valve is incorporated in the drain conduit from the aquarium, wherein the float valve is operated by the water level of filtered water within a sump, such that if the water level in the sump rises above a predetermined level due to inadequate water return to the aquarium, the drain conduit will be closed by the float valve. A pre-filter is incorporated in the drain conduit to filter water upstream of the float valve, with the filter preferably being a sock filter enclosed in a sealed housing which remains filled with water. Most preferably, the float valve and any pumps utilized in the system are submerged within the water in the sump to reduce noise.
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