Question: We are having the problem of drain fly in one of our building in
mumbai, India. But this problem is their only at one particular flat. No
other flats are affected by this fly. Please tell us the solutions for
this. and can we find the product in India which you will suggest.
ANSWER The immature stages of drain flies live in the accumulated organic matter in the drain. The larvae feed on this material, and are usually 'buried' in it. The fact that they are deep in the material makes them quite resistant to chemical control methods (regardless of how strong the drain and pipe cleaner you use).
The best (only!) control for these flies is to remove the breeding site, which is the organic material that collected in the drain. If these flies are present in the house there is almost certainly a clogged drain. Find the drain and physically clean it out. Liquid drain cleaner will not solve the problem, you've got to physically remove the material causing the clog. Once the material is removed (along with the larvae) the problem is solved, except for the adult flies. They will live about 20 days. There may be a flying insect spray that can be used for the remaining adults.
