This is the original filter pads for SUNSUN HW-302/303/303B/304/304B Canister Filter
• Provides both mechanical and biological filtration
• Prevent the smallest dirt particles, while keep perfect water flow.
• Use for freshwater and saltwater aquariums.
• Promotes nitrogen cycle reduce the death rate of fish
• Can be used again after cleaning
Number of sponge per pack – 2