Our medium replacement filter cartridges are designed to be compatible with Whisper PF10 Power Filter, 10i Internal, and ReptoFilter 90. Ideal for use in 5-10 gallon fish tanks or aquariums, ensuring optimal performance and effective water cleaning. Featuring a 5-in-1 filtration system, this product helps maintain clear water. Dual-sided mesh traps debris and fish waste. Contains 40% more activated carbon for extended and thorough filtration. Includes zeolite and ceramic filter media, which help remove ammonia and heavy metals. Despite enhancements such as increased activated carbon and the addition of zeolite and ceramic media, the product remains affordable. Designed to support a clean and healthy environment for aquarium inhabitants. These medium aquarium filter cartridges are easy to use. Pre-assembled and ready to install after rinsing with water. Simply place into a compatible Whisper filter for immediate operation. For best results and proper aquarium maintenance, replace the filter every 2-4 weeks. Quantity: 12 Pieces Color: Green Material: Non-woven fabric Package Contents: 12 x Medium Filters Note: The package includes only the items listed above. Light reflection and display settings may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3 cm.