TERRO Drain Insect Killer - T590 Drain Fly Killer Spray - Foam Treatment for Fruit Flies, House Flies, and Cockroaches

This stuff works and I am pleased with the out come but it did take three applications. I live in an old house, about 100 years old and the gnat's seem to appear every summer. I also live by a lake so I don't know if that has anything to do with it. I would say it was an infestation, I couldn't eat without them buzzing around me. I am one of those people that is a bug lands in my food, it's now the dogs food so these things were maddening. (And yes, I know it's irrational to stop eating your food just because a tiny bug lands on it but gross's me out and that's the way it is.) Forget about drinking red wine because they love it and land in it immediately. In any event, the gnats literally drive me crazy. I hate them! I have tried everything to get rid of them. The vinegar, soap, water traps. The lights with the sticky cards. Anything I could find. These traps catch the gnats but they don't get rid of the problem. I saw this and thought I would give it a try. I ordered two cans to start with because I have three full bathrooms, a utility sink, plus the kitchen sink. The first time, I performed the application at night on July 7th and then went to bed. I used both full cans, which was mainly because I was figuring out how to use it properly and I put almost a full can in the garbage disposal. I would say in the next couple of days you could see a significant reduction in the number of gnats and I found several in my bathrooms dead. I figured it would take a couple of applications due to the other reviews that I read. Within about four days, I saw them beginning to increase again. I ordered two more cans and applied about 1.5 of them the night of July 12th. That is 5 days following the first application. Following that application, there was another significant reduction in the gnats and I was still finding dead gnats on my bathroom floors. After the first two applications there was a significant improvement in the quality of my life. Just chipping away at killing these gnats and I was/am determined to rid my house of these pests! Ordered two more cans. I was leaving for the weekend so I thought a perfect time for another application and then it would be able to sit for a couple of days. Applied another ~1.5 cans on Friday afternoon around 3:00pm on July 18th. Returned Sunday July 20th early evening. To my shear delight, I did not see any gnats! Monday, I saw one gnat. Tuesday, I saw one gnat. Wednesday I did not see any gnats. It is now Thursday morning and I have not seen any gnats. I am hoping that is the last of them but I still have enough product for another application if it is needed. So, in summary, it has taken me close to four cans to fully eliminate them over the course of 16 days. I ordered a total of 6 cans at a price tag of $95.82+tax so over $100 in total, so not cheap. Also, pretty sure the stuff is toxic because it says something about hazmat on the label for shipping. Hope this helps.

I had drain flies for over a year and could not get rid of them with drano, baking soda/vinegar, or even normal clorox bleach cleaner. I put this Terro foam treatment in the drain and saw immediate results. I had one drain fly the next day and haven't seen them since and its been a month now. One treatment and they were gone - this stuff really works!

Nice foam and good to use to fill drain to help rid drain of drain flies but if you have a real serious infestation you will need this plus Green Gobbler for drain flies and Gentrol Complete EC3. This product weekly and the other 2 daily until 2 weeks after drain flies are gone. Zevo lights help too.

Excellent. This product REALLY works .

Not sure if it’s the product, or the way we did the application, but the little tiny flies have still persisted. Are going to give another treatment and get a final result. So far, I have not stopped the little tiny black insects.

I have already recommended this to others. I prefer natural insect control so spraying even a “natural” product means I was at the end of that rope. The little flies that are inevitably present sometimes as I bring in harvests and garden critters were unusually bad. Vinegar and baking soda, and boiled water was just not ending the infestation (ok, it was one sink). What I realized is the bugs were going into a tiny opening into an enclosed space I couldn’t get to. This spray got into the space and the problem is solved. I sprayed the drain at the same time and I saw it expand quickly. Nothing offensive about the spray. It rinsed away easily. I’m keeping this on hand.

I noticed little black flies in my kitchen and thought they were fruit flies and gnats because my kids constantly leave the back door open in the summer and I have many house plants that attract fungus gnats. After cracking down on open doors, treating my houseplants, and using plug-in fly lights and fly tape -- I was still seeing the black bugs... After research I realized I might have drain flies! I ordered this product and it has eliminated my problem. The product is easy to use - simple aerosol can. It comes with a straw attachment so that I could shoot the foam far down my drain. After a few seconds it created a rich lather that foamed up into my sink fully coating the problem areas. While I only saw the flies around my kitchen drain and garbage disposal, I took the remainder of the can and proactively treated my laundry room sink, shower drains, and bathroom sinks. The can had way more foam in it than I original thought. It covered all the drains in my home with a bit leftover in the can afterward.

Super easy to use compared to the concentrate I had to measure and mix with water last year. About the same effectiveness- took a second application and a few extra weeks to eradicate the drain flies. One can filled the drains for five bathroom basins, two kitchen sinks, one laundry tub drain, three bathtub drains and one shower drain.

Great