Our medium replacement filter cartridges are uniquely designed to work perfectly with for Tetra Whisper PF10 Power Filter, 10i Internal and ReptoFilter 90 GPH. Primarily intended for use in 5-10 gallon fish tanks or aquariums. This ensures best compatibility and effectiveness in keeping your waters clean and clear. Featuring a state-of-the-art 5-in-1 filtration system, our product makes clear water simple. Dual-sided mesh works hard to catch debris and fish waste. It contains 40% more activated carbon for long-lasting and thorough filtration. It also includes novel aquarium filter media Zeo-lite and new filter media - Ceramics, which absorb heavy metals and improve water taste. Despite significant advancements in our product offerings including 40% more activated carbon and the introduction of two new filtration media - zeolite and ceramic, we strive to maintain affordability. Our focus remains on providing a cleaner, fresher space for our wet friends without burning a hole in your pocket. Our medium aquarium filter cartridges are convenient and straightforward to use. They come completely assembled and once rinsed with water, they can be easily placed in a for Tetra Whisper filter for immediate filtration. We recommend changing the filter cartridge every 2-4 weeks for best results and maintenance of your aquatic environment. Quantity:12Pcs Colour:Green Material:non-woven fabric Package Contents: 12 * Medium Filters Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.