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BPA FREE SAFE MATERIAL - Aquarium filter sponges are made of premium filter foam, will not alter the PH of water, suitable for freshwater and saltwater aquariums, harmless to fish and shrimp. High density protective structure: These aquarium filter sponges do not block the water flow, prevent small fish from being sucked into the filter and promote their healthy growth. EFFECTIVE FILTRATION, LONG LASTING: Aquarium filter sponges retain debris and particles, reduce clogging and extend the life of the original filter material. QUICK INSTALLATION & EASY CLEANING: Aquarium filter sponges are placed directly on the filter inlet, quickly attach to the suction hose and remove easily for maintenance. Standard 9 Pack - The package contains 9 pieces aquarium filter sponges with fixed sizes (8cm height, 4cm diameter, inner hole 2cm), compatible with most household filters.