| 摘要 |
A contaminated-water intake or suction fitting is mounted near the bottom of the aquarium tank adjacent one end thereof and connected by a pump intake pipe to the suction port of a water pump. The discharge port of the pump is connected by a pump discharge pipe to the top of a multi-media pressure filter containing superimposed layers of filtering materials which filter the contaminated water from the aquarium tank. From a chamber at the bottom of the filter, a filter-water discharge pipe returns the filter water to a water discharge nozzle located adjacent the opposite end of the aquarium tank at the bottom thereof in aligned spaced relationship to the suction fitting. The current of water thus forced along the bottom of the aquarium toward the suction fitting sweeps sediment and other impurities along with it to the suction fitting whence the pump delivers the thus-contaminated water back to the pressure filter. Meanwhile, the current of water flows upward from adjacent the suction fitting in an orbital path along the surface of the water in the tank, thence back toward the water discharge nozzle, thereby aerating the water.
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