Features: • 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 • Reusable, Can be used again after cleaning
Blue Sponge Size: 24cm x 24cm x 2cm 25PPI Blue Sponge Material: High quality synthetic pored blue form
White sponge Size: 24cm x 24cm x 1.5cm White Sponge Material: White Cotton