TOTALLY REMOVES ODORS – Zeolite is a natural mineral that removes ammonia odors from the air. It Soaks up ammonia gas on contact and absorbs urine odor before it leaves the litter box LONGER EFFECTIVENESS – Pureness F6 Zeolite Air Filter is effective up to 3 months of usage COMPATIBILITY – This can ONLY be used on Pureness Enclosed Cat Pans 100% ECONESS SAFE – It is 100% eco-friendly and safe because it uses green products that won't harm the nature BUDGET-FRIENDLY – You can buy your favorite Pureness F6 Zeolite Air Filter in packs. The package contains 12-pack in a case at a reasonable price