Need help with getting rid of drain or sewer flies
For the last few years when the temp reaches 85-90 I get a house full for drain flies. They are in multitudes in the septic tank because I have removed the cap to allow them to escape into the air hoping that will reduce the number wanting to come into the house. I have plugged or taped over every drain except for the washer pipe and the watersoftener pipe which darin into the same thing on opposite sides of the wall. They have P trap drains and are used frequently. I have repotted my houseplants, checked under the sinks, checked the drip pan under the fridge. I have not pulled out the dishwasher. I am afraid to do that alone since my husband (who is not handy at all) is currently out of town for a couple of weeks. In the past I finally break down and get the septic tank pumped out and they will clear up in a little while. The pumper says it is not necessary to pump every year and it costs about $150.00. Does anyone have a solution? Is there a product I can safely use in the tank or pipes to kill them without ruining the bacteria neede for the sewer breakdown in the septic tank? Please help if you can.