The odours from an anaerobic digester and a waste handling depot were fed to two large biofilters with wood chip packing. The seeding of the biofilters was carried out using a microbial product, BFL Odour Clean. For the initial seeding of the biofilter with microbial cultures a manual method of application was used. Careful application of the product to the entire filter bed is key to the success of the application. The use of natural microbial products provides the most effective and environmentally acceptable way to treat the odours from this waste handling facility.