TERRO Drain Insect Killer, 1-Pack, Foam Treatment for Indoor Infestations | Kills Cockroaches, Drain, House, & Fruit Flies, Extension Tube Application, Drain Fly Killer, Works on All Pipes

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.

We had annoying little drain flies popping up around our kitchen sink, and liquid drain cleaners just were not getting the job done. I bought this foam treatment, and it was a total game changer. The fold-up extension tube made it super easy to spray deep down into the pipes, and the thick foam expands so you can actually see it coating the inside of the drain where the bugs breed. I sprayed both sides of our sink before heading to bed, let it sit overnight, and noticed a massive drop in flies by the very next day. It didn't damage our pipes or leave behind any harsh chemical smell, and we haven't seen a single bug come back since.

With the apple thing and this spray I noticed a HUGE difference. And I’m so happy with the results. I noticed a difference in one day. So I put in all the drains in my house as coverage even though the issue was my kitchen sink. Once before bed and I did it right before we leave for work. I will be buying again. And the smell isnt strong either so that’s a plus.

I have nasty tiny little critters leaping out of just one drain in one bathroom. I have tried many bug killers but this one works great. There is no scent. It kills all the bugs for weeks. I just ordered 2 more. It doesn’t take care of them forever so I ordered an extra one so I’m ready. Cannot find it in stores

We moved into an older house and the drains were not only clogged but also full of gnats. I bought this and a product to unclog the drains. The first application helped tremendously with the gnats and clog. The gnats stayed away for a few weeks. I am assuming new eggs hatched because last night they were coming out of the drain again. I applied more of this product in the drain and left it overnight. There are dead bugs in the sink this morning and no more are flying out. You may need to do more than one application but it does work. I love the spray nozzle that allows you to get down into the drain. It doesn't have any chemically smell or strong odor. Easy to use.

This product does not travel through pipes like they show it doesn't even go 18 inches down the drain. It does not kill the drain flies. I emptied the whole can in both sides of my standard kitchen sink and covered up both drain holes overnight. Once I rinse the drains out the next morning by that afternoon more flies we're coming out of it. You also have to have the can at an angle because the nozzle is so short and at a 90° angle that once the can gets low enough it only leaves a third left because it starts blowing propellant like any other aerosol can. The only way to use the rest of it is to have it completely upright. Poor design means you only get to use 2/3 of the product. Do not buy this you're better off pouring baking soda and vinegar down your drain and when it foams up cover both drains and leave it overnight. This was a waste of money. I don't know how they can charge so much for something they had to have known after testing didn't function properly.

I'd give it a higher rating if I could get all of the product out of the can. Too expensive to have to throw some away. Seems to be helping me with the phorid fly problem that I think is coming from the pipes but you have to keep retreating.

Terro was very easy to use. Just point deep into your drain and shoot until you see it come up to the top. They say to cover the drain to prevent any flies from trying to escape. So I used my sink strainer and a paper towel to keep them in my drain. I'm not sure about drying time because I sprayed my drain before I went to bed and in the morning I simply rinsed my drain. I found this product to be highly effective. I did get a slight smell but it was not offensive. I have cats so anything I use must be safe for them. I am blessed that neither of my cats jump up on my counter, so I really don't have to worry much about safety for them but I still try to be careful anyway.

It does the job. No more drain flies for my bathroom!!!

ممتازه جدا جدا ومفعوله قوي وسريع

While spraying the solution stays liquid, and drain flies just escape via the drain back up.

easy to use

Great