General description This 6 Pack Replacement Carbon Filters set is designed for Avalon and Pagoda Ceramic Waterers with capacities of 7.5L, 3.7L, and 1.8L. It features a three-layer filtration system that ensures your pet's drinking water remains fresh and clean. Technical specifications Includes: 6 replacement carbon filters Includes: 6 foam pre-filters Filtration layers: Cotton and activated carbon Compatibility and accessories Compatible with 1/2 gallon, 1 gallon, and 2 gallon pet fountains Compatible with Butterfly, Avalon, Pagoda, Seascape, Sedona, Seaside, and Creekside models Installation Soak the filter in water for 5 minutes before use Rinse thoroughly with running water Usage Replace the filter every 4 weeks in summer Replace the filter every 4-6 weeks in winter More frequent changes may be necessary if multiple pets use the fountain