Products http://www.publicworks.com/ Tue, 06 Apr 1999 21:20:32 GMT The General Filter Multiwash Process uses sustained simultaneous air and water backwash to keep media clean and eliminate fouling with biological solids or chemical precipitates http://www.publicworks.com/product.mvc/Backwash-Process-0001?atc~c=771+s=771+r=001+l=a Tue, 06 Apr 1999 21:20:32 GMT