External filter assembly for aquariums
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United States of America Patent
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Mar 17, 1998
Grant Date -
N/A
app pub date -
Jun 12, 1995
filing date -
Jun 12, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
External filter assembly for aquariums includes a filter chamber containing a mechanical and/or chemical filter and a functionally active filter upstream of the mechanical filter for actively filtering the water before the water is filtered by the mechanical filter. Fresh air is mixed with the aquarium water immediately upstream of the functionally active filter whereby the functionally active filter is directly exposed to both dissolved oxygen in the water and atmospheric oxygen mixed in the water which significantly improves both the efficiency and capacity of the filter in performing its active function. Both the mechanical/chemical filter and the functionally active filter are cartridge type filters, whereby either may be replaced without disturbing and/or affecting the operation of the other. Also, one type of active filter cartridge may be replaced with another for performing different active filtration functions, such as biological filtration, protein skimming, ultraviolet sterilization and denitrification.
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