Pack of 4: The filter sponge can be washed and reused. For optimal performance, we suggest you to change the sponge filter at least every 1-2 months
Excellent Filtration Performance: The filter sponge is made of high-quality cotton and built-in filter material, the groove design increases the filtration area, which contributes to high filtration efficiency, and effectively absorbs odors and discoloration, helping to maintain a good aquatic environment.
Easy Installation: AQQA filter sponges are designed to be easily changed or replaced; Please soak the new filter sponges in the tank for a while before using
Fits AQQA Powered Aquarium Sponge Filter (AQ016): Size Small will fit AQ016-S-3w, Size Medium will fit AQ016-L-5w
Wide Application：Suitable for freshwater and saltwater aquariums