When I tried to install a cartridge, I could not, no matter what I did. I then noticed that what was preventing the proper snug fit were two small ridges either side of the inside of the base of the jug, which held Brita cartridges firmly. These Bargain Fox cartridges do not have the indentations necessary. I studied the box, which stated, in tiny letters: "Bargain Fox Basic are compatible...with most BRITA water filter jugs (not compatible with BRITA Style jug). I checked the description on the Bargain Fox page, and saw the same information. When buying, I did not even notice this, as had no idea my jug was actually called a Style jug, and in the photos the Bargain Fox filters looked the same as Brita's. So before wasting your money, check the type of jug you have!!!