| 摘要 |
A filtration system, especially for use in aquaria has a lower or first chamber, a middle or second chamber and an upper or third chamber with an interconnecting valve to provide fluid communication therebetween. A microfilter is disposed between the first and second chambers. The upper or third chamber may be divided into two separate parts; one of which parts forms a gravel filter, and the other of which parts forms a pump conduit between the valve and an outlet of the system for connection to a suction pump. Alternatively, a separate pump conduit may be used. The valve is switchable between a first position wherein water is drawn through the gravel filter, into the upper or third chamber then into the middle or second chamber via the valve, through the microfilter into the lower or first chamber from which it is pumped through the valve and out the pump through the pump conduit; and a second position wherein the water flow is similar to that of the first position except that it flows in the reverse direction through the microfilter, that is into the lower or first chamber and then into the middle or second chamber. The reversal of flow through the microfilter provides for flushing the microfilter, thereby maintaining its efficiency. The water from the pump, during flushing, should be directed out of the aquarium.
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