TERRO Drain Insect Killer Spray

Unlike chemical drain cleaners designed to dissolve clogs, this product is a pesticide specifically formulated to eliminate insect larvae living in your pipes. It is not intended to clear blockages or improve water flow.

No, the dry foam formulation is safe for use in standard plumbing and septic systems when used as directed. It is designed to coat the interior surfaces of pipes without causing corrosion or damage.

Yes, you should allow the foam to sit in the drain for several hours or overnight to ensure it fully coats the pipe surfaces and effectively targets the larvae. Avoid running water down the drain during this period.

This product is specifically formulated to target drain flies, fruit flies, and house fly larvae that breed in organic matter within drains. It will not be effective against other household pests like ants, spiders, or roaches.

While you can spray directly into the drain opening, the included extension tube is highly recommended. It allows you to reach deeper into the pipe where larvae are most likely to be breeding, ensuring more thorough coverage.

For an active infestation, you may need to apply it daily for several days to break the life cycle of the flies. Once the infestation is under control, you can use it periodically as a preventative measure if you notice flies returning.