Complete Filter Maintenance Set: This comprehensive kit includes 6 premium replacement cartridges specifically designed for CF1 filters. Each filter cartridge measures 9.5x7.2 cm and features primary filtration cotton material that provides optimal water flow and mechanical filtration for your aquarium system. Superior Filtration Material: Crafted from high-quality primary filtration cotton that effectively captures debris, waste particles, and suspended matter from aquarium water. The dense yet porous structure ensures excellent mechanical filtration while maintaining optimal water flow rates without restricting filter pump performance. Enhanced Water Quality Performance: These fish tank filter cartridges work efficiently to remove physical impurities and maintain clear water conditions. The filtration media helps support stable water parameters for fish and plants. Easy Replacement Procedure: Simply turn off your CF1 filter, remove the old cartridge, and insert this replacement unit. Pre-rinse the cartridge with dechlorinated water before installation to remove any initial dust and ensure immediate performance with minimal disruption to your aquarium's ecosystem. Reliable Filter Compatibility: Specifically engineered to fit CF1 internal filters perfectly, ensuring secure operation and maximum filtration efficiency. Ideal for aquarium enthusiasts who want to maintain consistent water quality and provide a healthy habitat for their aquatic pets between regular maintenance schedules.