It kills the fleas for about 12 hours

Black Flag Extreme Flea Killer works. Got rid of the fleas in the house.

I have to reapply everyday atleast2x a day. Fleas keep reproducing, just not AS MUCH. There is an improvement, which is why I did 4 stars. But it ISN'T a forever thing and it needs to be reapplied a few times more. It's been about a month now, and I have less fleas, but still new fleas keep coming out

Yeah this works well to keep the fly blood suckers out of your hair as well as the jumping blood suckers after your pets. I do like the bottle of this product that fits on your garden hose more. I find it's lasting about 5 days longer than this. I of course pour this into a pump and spray bottle mix with about a gallon of water and spray once a week to keep my pets free and me free of bug bites.

I had a seriously bad flea infestation in my sunroom. Like. No. Y'all. Flea medicine on the cats wouldn't even save them. I would have fleas up to my -hips- in less than a minute. I would have to wash off outside with the hose before going back in the house, and even then they -still- found their way into my hall, my bathroom and my bedroom to start eating ME. It. was. a. nightmare.

I tried everything I could think of. I'm not a fan of synthetic pesticides and chemicals, especially around my pets, so I tried diatomaceous earth, I tried essential oils, I tried powders and potions and prayer, let me tell you.

No dice. Even God didn't want to deal with my flea infestation.

I fantasized about packing up everything, cats and all, and just burning the house to the ground. And there I was, on Amazon shopping for matches, when I found this product and decided I could at least give it a go first.

I saw the bad reviews about the junk sprayer, so while I waited for shipping, I bought a sprayer bottle in town. I'm not about to deal with frustration just to try to deal with my original frustration. I ignored the 'do not open this totally-openable spout' directions, and poured myself a spray bottle full. 16 ounces. I shut the cats out of the sunroom and sprayed. I sprayed the floors. I sprayed the furniture. I sprayed the walls. I. sprayed. the. ceiling.

Thank God for N-95 masks, y'all, because I was -fumigating- myself in there. I sprayed about half the bottle over a 200 square foot room, but that's probably excessive. It was dripping down the walls, and the floor needed a caution sign.

While that dried, I went outside and hosed the hoard of fleas off my legs. My sunroom was the Titanic, and I was a big door. Goodbye, Jack. I sprayed my hall with a vengeance, my bathroom with impunity, and my bedroom with righteous indignation. I found a sadistic glee in watching them wriggle in the shallow pools of death-water that puddled on my floor.

They did not go gentle into that good night, no. Days passed, and they were, if anything, more mutinous than ever. Manic and angry--I swear they took me for their Goliath. Or their all-you-can-climb buffet. The cats were going mad too, and they took to playing 'the floor is lava', for understandable reasons.

But there were a few less fleas. And after a week, I doused the place again and hit the deck and walkway while I was at it. Then there were a few less. So after another week, I sprayed again. And then, miraculously, I walked into my sunroom and found my cats LAYING ON THE FLOOR!

They hadn't touched the floor in weeks! At least, no longer than it took to leap to another vertical surface and wildly groom themselves. I thought they must be sick! Then I realized after looking down that there weren't any fleas on me. None. In fact, what I -thought- was a flea was actually a new freckle on the top of my foot.

I won. Ha!

That was months ago, and not only have I not seen a single flea, I also haven't found a single (live) waterbug, spider, fly, or cricket. Apparently this stuff works on just about everything. Thank God.