Take the plunge into crystal-clear, healthy aquarium water with Aqueon MiniBow Replacement Filter Cartridges. These preassembled powerhouses install quicker than a fish can swim and are packed with patented dual-sided dense-floss cartridges to tackle even the finest particles and debris. Unleash the power of activated carbon, which removes toxic impurities, odors, and discoloration from your fresh or saltwater aquarium. Keep your Mini Bow in tip-top shape by replacing your cartridge every 4-6 weeks for optimal performance. These cartridges come in a variety of sizes to fit your needs, so don't let cloudy water rain on your aquatic parade.