Keep your aquarium clean and healthy with Tetra Whisper Bio-Bag Cartridge Unassembled Medium 12-pack. This canister filter is perfect for a 40-gallon freshwater tank and is made by Tétra, a trusted brand in the fish and aquarium industry. The filter is designed for external use and is easy to install.

The 12-pack of cartridges ensures that you have enough for regular maintenance, keeping your tank crystal clear. This product is made in the United States and is available with free shipping. Get your hands on this reliable filter and give your fish the clean and healthy environment they deserve.