Petmate Booda Cleanstep Filters by Petmate $6.95 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart The Petmate® Cleanstep Filter will keep your cat's litter box smelling fresh all day long! Filters are safe, natural, and non-toxic, making pet and pet parent happy. This filter quickly absorbs unwanted litter box odors. Made in the USA.