Features 1、MULTI LAYER FILTRATION: Aquarium sponge air driven filter is designed with multiple layers of different filters, safe and non toxic, no harm to fish tank water quality. 2、CONVENIENT TO USE: Aquarium sponge filter can be placed directly into the fish tank, simply connect it to the air pump (not included). 3、PHYSICAL AND BIOCHEMICAL FILTRATION: Fish tank air driven filter combines physical and biochemical filtration for fish with increased oxygen solubility. 4、GOOD FILTRATION EFFECT: Aquarium sponge air driven filter has stronger filtration effect and multi‑layer filtration to ensure clearer fish tank water. 5、PREMIUM MATERIALS: Fish tank air driven filter uses plastic, filtering cotton and filtering stone filtration to effectively filter fish tanks. Specifications: Item Type: Aquarium Sponge Air Driven Filter Material: Plastic, Filter Cotton, Filter Stone Use: Fish Tank Filtration Package List 1 x Aquarium Sponge Air Driven Filter