Keep your aquarium cleaner and healthier with the Top Fin Silenstream Cartridge. This highly effective cartridge is perfect for Top Fin Power Filters, and contains active carbon to absorb undesirable odors, pigments and chlorine. Features: Active carbon to help absorb undesirable odors, pigments, and chlorine Caution: Never use soap, detergents, or cleaning agents while cleaning the aquarium or equipment as they can harm your fish. This is not a toy. Keep out of reach of children.