Description Twenty One 1kg is a uniquely formulated product for professional use against flies in poultry, pig and livestock housing. The only product that can be diluted in water and sprayed onto walls, ceiling or floors of cowsheds, stables, piggeries, poultry sheds, waste management sites and other agricultural environments. Or mixed into a thicker emulsion to be painted onto boards and hung. Contains fly pheromones and attractants that lure the flies to the treated area for fast and effective control. If correctly applied as instructed, Twenty One fly killer can be effective for up to 10 weeks. 10% Azamethiphos