Aquael Pat Mini Standard Filter Media. Maintain pure and safe water quality in your aquarium with the Aquael Pat Mini Standard Filter Media, a highly-effective replaceable sponge designed specifically for the Aquael Pat Mini Internal Filter. This single (1 Ct.) sponge provides superior mechanical filtration, measuring approximately 2.32 in x 1.97 in x 4.29 in, and is crafted from a high-quality, phenol-free material. By efficiently trapping debris and particulates, this media ensures your water remains clear, promoting a healthier environment for your aquatic life. Instructions: Simply replace the old media with the new sponge, following the directions for use included on the packaging.