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

easy to use

Great

Foaming is weak

Gave me 2 applications before it stopped spraying even though there is plenty of product still in the bottle. Not worth the price. Drain flies still present also.

Excellent

I can't say if this single product cleared out my drain flies but I did notice when the foam expands it brought all kinds of gunk up from the inside of the drain. Even after I thought I cleaned it pretty good. Gunk included a couple dead drain flies. Not sure if they were already dead or killed in the form but who cares - they're dead! I found it easy to direct the spray into the drain and it didn't take too much to fill the drain. I've still got plenty left after several treatments. My mom has COPD and I've got allergies that can be triggered by odor/perfume and this product did not cause any issues. There is almost no scent. I used this after letting Zevo flying traps (UV lights) run for about a week. Also treated the drains with Green Gobbler overnight. I still get the odd drain fly but I live in an apartment so it's possible some are coming over from other units.

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.

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.

I had gnats coming from my lower level bathroom sink and kitchen sink. I ordered the Terro but decided to try the baking soda and vinegar home remedy while I waited for delivery. The baking soda and vinegar worked on the lower level bathroom sink but not the kitchen sink. The Terro arrived quickly, the next day after I ordered it and I sprayed it down the drain in my kitchen sink and my lower level bathroom sink (playing it safe). After covering the drains overnight with plastic wrap, the next morning there were no gnats in the lower level bathroom sink but there were some in the kitchen sink but not coming from the drain because there were none attached to the plastic wrap which had the drain area seal tightly. I noticed a gnat crawling along the part of the sink that’s sealed and it disappeared, going beyond the sealed area so I used the Terro and sprayed all around the “alleged” sealed area and since I did that, all gnats are completely gone. Thanks to the Terro working so good, I sprayed it down the drain of my upper level bathroom, the shower drain and the floor drains in the basement, even though I didn’t have gnats in those areas, I didn’t want them to start popping up anywhere else. My home is now completely gnat free and although I can’t believe it worked, I’m very happy it did!!

I have tried everything from apple things, blue light things, green gel stuff, drain clog stuff, powder foaming stuff, bug zapper in the house and gallons of hot water. This foam gets in the crevices of the over flow in sinks and around the edges of walk-in showers. We talked with a professor at Mississippi State and he determined we had phorid flies which breed in drains or any organic scum matter. The trick is breaking the life cycle. They look like fruit flies but have dark eyes. When we sprayed the foam in the drains and over flow, flies started coming out of the drains. We covered the drains overnight. We noticed a big difference the next morning. It gets about 4 to 5 drains per can. The trick is shaking the can several times while using the spray to maximize foam. It is pricey to do all the drains every night for several nights. However, it was this or sell my house. (Tip: Undiluted 99% alcohol in a spray bottle kills the flying adults.)