🌊 Dive into Cleanliness with Tetra's Bio-Bag! Weighing only 6.7 ounces, these filters won't weigh you down! Carbon-infused pads trap odors and gases, ensuring a fresh aquatic environment. Designed for easy assembly and replacement, keeping your tank pristine. Experience superior biological filtration that eliminates harmful ammonia. Each pack contains 4 cartridges, tailored for hassle-free use. Biological filtration Easy to replace Lightweight design The Tetra41004 Stay Clean Bio-Bag Large 4 Pack offers an innovative solution for aquarium maintenance, featuring easy-to-use disposable filter cartridges that enhance biological filtration, effectively removing harmful ammonia and odors. Each pack includes four lightweight cartridges, making it a convenient choice for any aquarium enthusiast.