I will try and keep this review short and hope that it helps you with your gnat problem. I came home from work one day, last September, and noticed a few gnats, but didn't think too much about it. I had never had a problem with gnats, I never dreamed I would spend a year trying to get rid of them. I bought some window adhesive strips and put on the window in the bathroom, that is where I saw them. Within a week of that they were growing in numbers. I first tried bleach, then tried using baking soda, salt and vinegar for months, that didn't really help. I wasn't sure which drain they were coming from, be it the shower drain or sink drain or both. As time went on the gnat problem was growing. It's now 5 months later and still have the problem. I called a plumber out, he said, Oh, you need to call a pest control company. I called a pest control company and he said use Vinegar, salt and baking soda. LOL I went back online and purchased a KATCHY Indoor Insect Trap: Bug, Fruit Fly, Gnat, Mosquito Killer - UV Light, Fan, Sticky Glue Boards Trap Even The Tiniest Flying Bugs - No Zapper. This worked great! Well, I thought it fixed the problem. But no, gnat problem didn't go away, because I had not gotten to the root of the problem. It's now 8 months later. I went online and read and read about gnats. What I was learning was that I need to get rid of the larvae in order to get rid of the gnats. I found Rockwell IBDC128 InVade Bio Drain Gel. This is a great product. It really cleaned the walls of the drain, but still didn't get rid of the problem. Next product was InVade Hot Spot Bio Foam. This is basically the same product as mentioned earlier (Rockwell IBDC128 inVade Bio Drain Gel) but it's in foam form. This is a great product, it allows you to turn the can almost upside down, to spray foam in your drain. Doesn't take much, so it last longer. But, unfortunately that didn't get rid of the gnats. So, went back online and searched again for something to help me with this problem. Next product I found was Gentrol Concentrate IGR Insect Growth Regulator 10x1oz ZOE1006B and Green Gobbler Fruit Fly Goodbye Gel Drain Treatment | Drain Fly Killer | Fruit Fly Killer | Drain Flies Treatment | Fruit Flies Treatment | Drain Fly & Fruit Fly Eliminator, FINALLY I found something that was getting to the larvae. That is what Gentrol Concentrate IGR Regulator does. It kills the larvae. It doesn't kill the adult gnats though. You will still have to deal with the adults until the product has successfully killed all the larvae. This can take as much as 2 weeks and then a week or so of treating the problem to make sure it doesn't come back. The key is to treat the larvae everyday. Thank goodness I found Gentrol and Green Gobbler. I mixed the Gentrol with the Green Gobbler in a 16 oz squeeze bottle. Use gloves when handling this. It took 1 month after I started using it. I can't say enough about Green Gobbler and Gentrol Concentrate IGR Regulator along with the KATCHY machine. They have successfully gotten rid of the gnats. You may not have the problem as bad as I did, but I wish I could have had this information to help me figure out the fix for the gnats. Lots of luck!

Pour in about half cup at night and don't turn faucet on till morning

We had drain flies in one of our bathrooms. This stuff got rid of them completely with just two treatments (one day apart). Very easy to use and extremely effective.

We have gnats that didnt go away. So our pest man recommended this and it works after a few days of adding like the instructions say

Ok, I'm one of those people who never leaves reviews but was so blown away by the effectiveness of this product, that I had to come here to convince anyone who is on the fence that THIS is the product you want to get rid of fruit flies.
Story time.

A long long time ago I had shower drain flies, and they were horrific to get out. The Green Gobbler stuff never worked and it took several months, and scarred and haunted me permanently, but eventually we got rid of them after snaking the drains and replacing pipes....
Fastforward a few years and I'm living with roommates, all of us cook a lot, and some of us conveniently ignored dishes or fruit in fruit bowls that were there longer than they should be..... cue Fruit Fly Invasion. To my horror, I went to the sink one morning and they were EVERYWHERE. It felt like hundreds of tiny, Itty bitty monsters, flying through the air and landing on EVERYTHING. NOTHING WAS SAFE. I was in pure annihilation mode. Not my home, not again...

Immediately I went straight to making the traps - Whiskey + Balsamic Vinegar in a jar with cling wrap on top, poke a few holes in the plastic and..... 2 days later that jar was FULL of trapped fruit flies. (Trust me, they like booze more than honey or soap, lol)
But when there were still more and more each day, I knew... these were drain flies, hiding and laying eggs in my garbage disposal or somewhere in my pipes. The traps would trap a portion of them, but they wouldn't solve the deeper problem.

I searched online far and wide for something that would coat the pipes and remove all organic waste so that they couldn't lay more eggs- because that's truly how to target them. I knew from experience that Green Gobbler does NOT do the job. So I ordered this.

I got this product 4 days ago. First I prepped the drains with about 2 gallons of boiling water on each side. I used 4 Oz of this amazing Orange goo per day on both sides of the sink drain for 4 days straight. We made multiple traps, got one of those plug in UV light sticky traps(ehich was also very effective), and deep cleaned the house, vowing to wash every dish immediately and take out the trash multiple times a day. And now......

My house is nearly fruit fly free. In 4 freaking days.
The traps caught fewer and fewer fruit flies each day. This morning, I only saw two left flying around. Miraculous.

We even mixed this product in water and used it to clean all of our trash bins too, just in case. All of our bins smell amazing now. The infestation was defeated in less than a week.

Am I satisfied? A resounding yes.
You having the same problem? Buy this product. Seriously.