Drain flies or moth flies
Drain Flies are also called moth flies, sewer flies or filter flies and they are a common pest in the UAE and can be really annoying. Their bodies and wings are covered with numerous hairs. If crushed they leave a powdery smudge. The flies are commonly found around drains, but they should not be confused with the Fruit fly, Phorid fly, or Sphaerocerid fly which also infest drains.
Drain Flies breed in drains, sewers, septic tanks and soil that has been contaminated with sewage.
In homes, adults are found on bathroom, kitchen or basement walls. More active at night, drain flies do not bite and, surprisingly, do not transmit human diseases. Drain flies feed on organic matter and sewage.
The best way to control drain flies is to remove their breeding site, which is most case will be organic materials collected in the drain, those organic material must be removed physically or treated well if they are out of reach, and the adults will stay without a place to breed and left to die in few days.