• Fluval U4 foam block specifically designed for aquarium internal filters. • Effectively removes large particles, ensuring optimal mechanical filtration. • Fits perfectly into the filtration chamber, preventing debris from passing through. • The pore size prevents blockages and maintains a constant water flow. • Ensures long-lasting and efficient filtration in the aquarium. • Product weight: 0.038 kilograms. • For use, place the foam block in the aquarium's filtration chamber to prevent debris from passing through. • The pore design prevents clogs and allows continuous water flow, ensuring prolonged filtration.