Drain and Fruit Fly EliminatorEliminate all drain born flies with this essential oil based gel. Drain & Fruit Fly Eliminator works by coating the walls of the pipes removing the scum that the flies feed on and lay their eggs in. By destroying the flies' habitat in your drains, you eliminate the flies at the source. When youve tried everything else, and nothing has worked, EcoStrong will get the job done. Kills All Drain Born Flies: Works on fruit flies, gnats, drain flies, sewer