Cynthia from Statenisland ,new York writes
Ive been treating the drain flies with gentrol and drain gel for months now but they don't disappear in our sump drain in our basement, My husband and I are so frustrated now , please help!
DF 5000 is a very good drain cleaner. Note that is does not have any insecticide in it. It is strictly used to clean bacteria in drains. You will coat the drain walls and do the same with the Gentrol IGR. You will coat these areas thoroughly as fly larvae develop in the scum buildup on the sides of drain pipes. You will repeat this every 2-4 weeks depending on the severity of the issue.
Answer last updated on: 11/15/2014
