petkit air purifying refills for purax puramax self-cleaning cat litter box, 100% natural ingredients odor remover, 4 bottles odor eliminating replacement refills, quickly odor control is up for auction in Pet Supplies. The current bid is $3.00, 85% below the $19.99 MSRP, in New/Like New condition. This auction has ended — similar items appear in live auctions regularly.