Zoo Meds Turtle Clean 318 Submersible Filter (TC-20) is the perfect filter for Turtle tanks! This filter is designed to be the go-to filter for Turtle tanks up to 30 gallons. It also works great for filtering Box Turtle "ponds" or aquatic Amphibian tanks. The 318 Filter provides a combination of Mechanical Chemical and Biological filtration and is fully submersible with easy to change filter cartridges. Dual intake ports help prevent clogging from debris. Includes: Packet of Activated Carbon Filter sponges (2).