I can't even tell you if they work because they are too small for the Booda I have. That's exactly what it says on the front and back of the packaging. I tried to get it working by pushing it in as best I could, but my cat ended up getting it out (simply because it doesn't fit) and playing with it, so I doubt I'll get it back. Petmate was wrong. I'm glad I only bought one pack! EDIT: I received a full refund and didn't have to return the filters. And I got an email from Petmate. They said something about changing the shape (although I've had my litter box for over three years) but suggested using their "Petmate Zeolite Filter for Hooded Trays" which is 6.2 x 6.1 x 0.5 inches should be and just a little I think that's the best they can do since they can't revoke all packets with the wrong information.
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