Replacement Filter Pads: These sponge foam pads are designed as replacements for FX4, FX5, and FX6 aquarium filters. Effective Filtration: The porous structure of the foam pads helps trap debris and waste, promoting a cleaner and healthier environment for your fish. Compatibility: Suitable for use in various fish tank setups, ensuring a seamless integration with your existing aquarium system. Easy Maintenance: Regular replacement of these filter pads helps maintain optimal water quality and filtration efficiency. Bulk packaged to save you money and save our environment from wasted packaging Ensure your aquarium remains clean and healthy with these replacement sponge foam filter pads. Designed to fit FX4, FX5, and FX6 models, these bio sponge foam filter pads effectively trap debris and waste, promoting a pristine environment for your fish. Made from high-quality materials, these durable pads offer long-lasting performance. Maintain optimal water quality and provide a comfortable habitat for your aquatic friends with this essential aquarium accessory.