Drain flies, also known as sewer gnats or filter flies, are small winged insects that are attracted to damp environments. They are often found near drains, sewage treatment plants, and other places where organic matter is present. Drain flies can be a nuisance because they breed and multiply quickly in these moist conditions.
The best product to get rid of drain flies is an insecticide that contains pyrethrin or permethrin. These chemicals will kill the adult flies and their larvae. Be sure to follow the instructions on the label carefully to avoid harming yourself or your family.