Keep your aquarium water clean and your fish healthy with the Tetra Whisper BIO-Bag Filter Cartridges. Designed for tanks with a capacity of 5-10 gallons, these medium-sized cartridges are perfect for use with Tetra filters. The advanced technology effectively removes impurities such as debris, odors, and discoloration from the water, ensuring a healthy environment for your aquatic pets. Crafted from high-quality materials, these cartridges are durable and efficient. They are easy to install and replace, allowing for hassle-free maintenance of your aquarium. With a pack of three, you can stock up on cartridges and ensure that your filter is always performing at its best.