SMELLRID Large Reusable Activated Charcoal Odor Eliminator & Air Purifier Pads bring a breath of fresh air to pet carriers， litter box areas and pet road trip vehicles or anywhere else you have stinky smells. SmellRid® 100g Large Packs are ideally suited to eliminate odors in any enclosed area. With severe odors， use one or more large SmellRid® Pack per 50 sq. ft. Rejuvenate them monthly by placing them in the sun for a day and reuse them again for three years or more. SmellRid® is scientifically proven to eliminate nasty smells at their source by pulling in odors and trapping them within a network of billions of molecular pores rather than masking them with harmful aerosols or plug-in air fresheners. SmellRid® also eliminates moisture and controls mold without toxic chemicals or scents.