I bought my first trap 20 plus yrs ago the house we moved in got a huge Flea infection in our basement, i tried Flea Bombs didn't work, So i said to myself its worth a try . It killed all the fleas Dead. I loved it. This Summer it happened again. but this time its even worse all the rain must of done it.. My basement is once again infested with Fleas. I bought 1 trap, it was helping but not enough so i bought another one . both in the basement. i ordered what i thought was refills and bought refills plus another trap. Today i set up the 3rd trap this time up in the house.after i discovered my puppies have flea so it in there room. i have 3 refills left so next week i have to order more.  just in case i did try flea drops on my dogs, & cats, flea collars, & flea powder  none of it working this yr . so I'm  giving a lot of baths this time around plus the traps. But i will swear by these traps 100%  They Do the Job without all these Chemical you put in your Home, Your Lungs and In your animals. But i sure wish you would put more refills in the Package It gets Very Costly  Ive already gone threw 12 so far