The filter sponge measures 3.9" x 2.3" x 2.1" and can be adjusted to fit your filter body. It enhances filtration by trapping particles and debris, extending filter life, and promoting efficient water flow with minimal clogging. For optimal performance, clean the sponge every two weeks and replace it monthly. Discarded sponges can also be repurposed to scrub aquarium walls, keeping them clean and tidy.