If you are not completely satisfied with your World's Best Cat Litter product, return the bag and/or the original upc code (proof of purchase) from the bag along with your store receipt to the point of purchase for a full refund or, you may receive your refund by mailing the original upc code from the bag and your store receipt (please include your name and full mailing address) to the address listed within 90 days of purchase for a full refund.