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Suitable for 10-30ltr aquarium tank

This Air driven, dual sponge filter system is a motor free filter, super quiet, only the smoothing sound of bubble bursting in the water surface. Its tiny and thin design make this filter so compact that can suit up to 19L aquariums. This internal filter must be run by air pump (at least 3-watt) and equipped with a check valve on the air tube to prevent flow-back. Single filter measures 19.3x10.5 x 2 cm, recommend for 7.5–19L freshwater and saltwater aquariums.<