Say goodbye to pesky gnats, drain flies, sewer flies, and fruit flies with EcoStrong Drain & Fruit Fly Eliminator. This powerful solution destroys the breeding and development habitat of these flies in your sink, shower, and floor drains, known as drain scum or bio-film. Without a place to lay their eggs and a food source, the flies will die off. Simply pour eight ounces down the drain each night until the flies are gone, usually within five days. Not only will the flies be eliminated, but so will any unpleasant drain odors, keeping your pipes clean and free-flowing.