TERRO Drain Insect Killer – T590 Drain Fly Killer Spray – Foam Treatment for Fruit Flies, House Flies, and Cockroaches
$17.59
Price: $17.59
(as of Sep 18, 2025 19:15:03 UTC – Details)
TERRO Drain Insect Killer is a powerful solution designed with a dry foam formulation that contains three Insect Growth Regulators (IGRs). This unique formulation reduces the chances of missed areas and provides full-contact, 360-degree coverage, making it highly effective for stopping and preventing infestations. The IGRs in TERRO Drain Insect Killer disrupt the normal development of immature drain flies, fruit flies, and roaches. Additionally, it disrupts the normal life cycle of drain flies and fruit flies, effectively eliminating them during their pupal stage, thereby breaking the cycle of infestation. To effectively use TERRO Drain Insect Killer, apply the foam into and around the downspout and catch basin to cover the entire area. When treating For a double-basin sink, be sure to apply it in both drains. Use the convenient fold-up extension tube for precise application into the pipes. Thoroughly coating these areas is crucial as fly larvae tend to develop in the scum buildup on the sides of drainpipes. The visible foam formulation ensures that no areas are missed during application. This product can be used on all types of pipes. Depending on the severity of the infestation, it’s recommended to repeat applications every 2 to 4 weeks to kill fruit flies and other drain insects effectively.
Leave the fruit fly drain treatment in the drain until the foam fully dissipates
Extension tube allows for precise application of TERRO Drain Insect Killer Foam
BREAKS THE LIFE CYCLE of drain flies, fruit flies, house flies, and roaches with drain flies killer
ELIMINATES INFESTATIONS AND PREVENTS NEW ONES – Use as drain flies eliminator to stop active insects and block future invasions
This fly spray can be used on all types of pipes
Customers say
Customers find the drain insect killer effective, with one mentioning it worked within 30 minutes, and they appreciate that it’s easy to use and has no bad smell. The product receives mixed feedback about its value for money, with some saying it’s worth the price while others find it overpriced. Opinions are divided on the foaming action, with one customer noting it covers the entire pipe while another reports it stopped producing foam after three uses. The sprayability and readability receive mixed reviews, with some finding it difficult to read the instructions.
8 reviews for TERRO Drain Insect Killer – T590 Drain Fly Killer Spray – Foam Treatment for Fruit Flies, House Flies, and Cockroaches
Add a review
Related Products
$17.59
intheboondox –
Works but may need a few applications
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.
TanyaKirk74 –
Will be using TERRO DRAIN INSECT KILLER anytime my drains are taken over by gnats!
TERRO Drain Insect Killer has a mighty dry foaming formulation that worked to kill the gnats that pester our drains.I ordered two 8oz spray cans to treat the drains throughout my home. Every year, my old farmhouse seems to be taken over by these tiny insects. When they get in our drains, it is hard to rid them until I used, TERRO Drain Insect Killer. The spray can is equipped with a yellow straw that fits down into the drains for ease of treatment. I followed the recommended steps listed on the can with positive results, after two full treatments.This works and I highly recommend! Will be using TERRO DRAIN INSECT KILLER anytime my drains are taken over by gnats!
Dee Griffin –
Get rid if drain fies and gnats
I am missed on this product to kill drain flies. Very easy to use just insert the spout into the drain until the foam comes up the drain. Let it stand either over night and then flush with hot water. Very easy process. You may need to apply at least for a week to rid your home of awful drain flies and flying gnats.
ChristineFlorida –
This product worked amazing
I moved out of my home to put it up for sale, and when I came back over there was so many drain flies I was really worried and upset, I called and exterminator and they said there was no guarantee that they could get rid of them. I used this product in the drains, and put stoppers over the drains and when I came back the next time they were all dead except for maybe five. The next time I came out to the house there was maybe one alive. So this product really worked and now my house is pending sale! Yippee you can’t go wrong with terro brand.
Michael –
Still tons of drain flies. Perhaps more.
Still tons of drain flies. I used half the can on two drains and there seem to be more afterwards. I then tried to use the rest of the can and it wasn’t really “foaming” to fill the pipe. It’s possible I needed a longer “straw”/distribution mechanism because the drain is deep, so I’m still giving this 3 stars. Perhaps if I bought more and continued use, it would help with our infestation but the first can didn’t do the trick.
Jamie M –
Disappointing waste
If you could actually use the entire can, might actually have something here. I bought 3 cans of this, was able to mostly discharge one of them after considerable effort and screwing around. There’s approximately a third of one of them left, given up on it. The last one is at least half full still, going to try and get a little more out of it. A disappointing waste of money and time really.
LS –
So pleased with this purchase
Recently bought a house, the basement apartment was full of sewer flies. I tried a few products prior to this one. They helped and knocked down the population for a bit, but then cane back. One treatment of Terro in each drain and haven’t seen one fly in 2 wks. Super easy to use and very effective.
Kikilore –
Worth the Money
Worked great and solved the problem immediately. I’ve tried everything for months and finally found this. Will buy again. Only thing I’d like improved is the directions made more clear on the can. Very hard to read.