专利名称：REVERSE FLOW AQUARIUM FILTER DEVICE发明人：WHITE E,US申请号：US3747762D申请日：19710510公开号：US3747762A公开日：19730724
摘要：A filter device in the form of a gravel supporting tray structure for use,particularly in an aquarium water purification system employing a tertiary filter cycleutilizing a shallow gravel trickling filter with underwater aeration and sedimentationfollowed by anaerobic action and final tertiary cycle.
申请人：FILTERS INT INC,US
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