Aquarium sponge filter media can be easily cut to fit most filters including hang-on filters, canister filters, wet/dry filters, sumps, pond filters and more. Buying in bulk will save you even more money than buying pre-cut, ready-made filter media. Bio Sponge filter media is safe for aquatic animals and is made without dyes. Suitable for freshwater or marine aquariums. Aquarium sponge filters are designed to last a long time. The dense structure of our sponge foam media prevents tearing. Regular cleaning! Can be reused after cleaning. It is durable. The complex structure of the sponge foam pads easily traps floating particles and debris from the aquarium and/or terrarium water, producing clear water. Size: 19.5 x 19.5 x 2 inches