The NITRA-ZORB SIZE 6 Aquarium Canister Filter Filtration Pouch is a must-have accessory for fish tank owners. This 2-pack of filtration pouches is designed to effectively filter out harmful particles and maintain water quality in your aquarium. With a size 6 fit, these pouches are easy to install and provide efficient filtration for a clean and healthy environment for your fish. Perfect for those who want to keep their tank sparkling clean and safe for their aquatic friends.