4 PCS of Biochemical Sponge for Replacement: The filter sponges can be washed and reused. We suggest you to wash the filter sponge every 1-2weeks and change the sponge filter at least every 4-6 months.
Physical Filtration: This sponge cotton can filter impurities and decompose harmful substance in water, providing your fish with a good aquatic environment.
Easy Installation: Size: 2.6*2.3*3.7in, easy to replace the filter media, just open the filter box and replace the filter sponge.
Easy to Clean: Wash the filter sponge with water in fish tank only every 1-2 weeks depending on the actual situation of your aquarium.
Wide Application: Suitable for both fresh water and saltwater, can be used with small fishes and shrimps.
