Penn-Plax Premium Under Gravel Filter System for 10 Gallon Fish Tanks & Aquariums

This air-driven filter utilizes an air pump (sold separately) to cycle water throughout your aquarium, promoting a crisp, clean tank. Each filter provides three stages of filtration—biological, chemical, and physical. The simple design features less moving parts for effortless ...This air-driven filter utilizes an air pump (sold separately) to cycle water throughout your aquarium, promoting a crisp, clean tank.

Each filter provides three stages of filtration—biological, chemical, and physical. The simple design features less moving parts for effortless aquarium maintenance. This filter is suitable for use in both freshwater and saltwater setups.

Plus, it aerates your tank through the same system for two-in-one convenience!