We highly recommend you replace the bio media that comes with this filter.

All you need to get the Sponge filters working is an air supply, and you’ve got an aquarium filter that’s not only reliable, but and hassle-free and easy maintenance. Sponge filters last for several years, and are reusable.

Make sure to rinse the sponge in dechlorinated water and not directly under the tap.
Used by fish farms and wholesalers for many years, sponge filters are a great choice for reliability.