"You might hear people refer to these flies as 'sink flies,' 'moth flies,' 'sewer flies,' 'filter flies,' and even 'sewer gnats,'" Yamaguchi explains. Drain flies are pretty small, coming in at ...

Drain flies, or sewer flies, can sometimes be confused with moths. This sludge-loving insect is small, with an adult's body being about 1/16 of an inch long. They are either gray or tan ...