Juwel Biocarb is an active charcoal sponge filter media designed for the Bioflow 6.0 Standard/H filtration system (size L). Each pack contains 2 pieces of high-quality activated carbon sponges that provide effective chemical filtration for aquariums. Key features: • Contains 2 activated carbon sponges • Compatible with Juwel Bioflow 6.0 Standard/H filter systems • Size L filter media • Provides chemical filtration • Helps remove discoloration and impurities • High absorption capacity • Easy to install and replace The activated carbon sponges help remove dissolved organic compounds, medications, and other impurities from aquarium water while maintaining good water flow. The sponges should be replaced regularly as part of normal aquarium maintenance to ensure optimal filtration. The large surface area of the carbon material provides excellent absorption of unwanted substances while allowing beneficial bacteria to colonize.