This is the right size for a Booda Dome Box WITHOUT a clean step. I bought others first and had to cut them. They fit perfectly. A few months ago I bought my purple Booda hood from PetsMart and was surprised to find that it had no filters or liners. I didn't know how often they would need to be changed either, but for some reason my girl's style with this box is to stand and spray, which somehow manages to hit the ceiling and filter out. About every two weeks I clean and wipe everything with antibacterial wipes (and of course I clean every day).
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