| Site B tertiary treatment system started 3/12/03. The unit is installed on a small sewage works with two gravel bed biofilters followed by a humus tank. The works are achieving border line compliance, but it is costing a great deal keeping the works in compliance. The pilot scale system takes its water before the humus tank, solids level is approx. 100mg/l in the feed water. The effluent water quality is approx. 5 mg/l. The filter is back-flushed back to the sludge collection tank, or to the beginning of the works. The system negates the need for a humus tank, simplifies the operation of the works, and provides for a great deal better water quality in the discharge. The photograph on the right shows the point of abstraction to the AFM® filter | 
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