6pcs Pack Carbon Filter For Litter-Robot 4 Replacement Parts 1. Superior Odor Elimination: Advanced carbon filters trap and neutralize stubborn litter box odors, keeping your home fresh and comfortable for both you and your feline friend. 2. Pet-Safe & Eco-Friendly Materials: Made with non-toxic, biodegradable activated carbon to ensure safety for cats, humans, and the environment. 3. Designed as a seamless replacement part for Litter-Robot 4 models—no adjustments or tools required. 4. It is recommended to replace the filter element monthly (6 pieces meet the needs of half a year) to maintain hygiene and freshness for a long time. 5. Bulk pack saves time and money compared to single purchases, perfect for busy pet parents. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.