I have had a problem with drain flies for about a year, I have tried everything mentioned online to get rid of them but to no avail. I do know they are originating in the furnace room in the basement. I thought it was the floor drain, cleaned with various gels, and pest control products for 6...

I had a waste pipe (thank goodness not a sewage pipe, but only from my kitchen sink and dishwasher) break under my house. Floor boards were ripped up in one room and a swarm of drain flies emerged. I was told that by fixing the pipe, and leaving the floor boards open for a few days, the...