| 摘要 |
The biological filter of the instant invention is intended for use between a septic tank and a drain field and includes a filter tank which receives effluent from a septic tank. The filter tank contains therein aerobic and anaerobic treatment means for treating, simultaneously, aerobically and anaerobically, portions of septic tank effluent. The filter is operable to significantly reduce the levels of all contaminants found in septic tank effluent prior to the releasing of effluent into a drain field.
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