🐠 Dive into a healthier aquarium experience! Three cartridges for uninterrupted filtration. Reduce fish stress with advanced zeolite technology. Maintain beneficial bacteria for a thriving ecosystem. Experience pristine aquarium clarity with every use. Quick and easy installation for busy lifestyles. Optimal for goldfish Adsorbs toxic ammonia Easy bi-weekly replacement The Marina Bio Clear Ceramic Replacement Cartridge is designed for optimal filtration in your aquarium, specifically for Marina Slim Filter Models S10, S15, and S20. Each cartridge features zeolite for ammonia absorption and Ceramitek for enhanced biological filtration, ensuring a healthy environment for your fish. With a convenient three-pack, these cartridges are easy to install and should be replaced every two weeks for best results.