Features: 1. Upgrade Electric Power Filter: Filter with powerful motor,no need air pump, Work more efficiently and energy saving.Internal Submersible is very quiet,Noise is less than 30db，Selected high-quality motors, longer service life. 2. Double Filter：Physical Filtration+Biochemical Filtration: The high-quality biochemical cotton adopts a ribbing design to increase the surface area and filter out automatically absorb feces, debris and residues in water.Bio Ceramic Media Balls improve the filtering effect, can quickly purify the water quality.Ceramic balls can also be replaced by other filter materials. 3. Water Outlet Can be Adjusted 360°and Stretch: The retractable water outlet can be adapted to fish tanks of various depths, and the water outlet can be submerged in the water or out of the water.Filtration can not only purify water quality and increase water circulation, but also increase the oxygen content in the water. 4. DIY Filter Media: The filter box can be filled with bio ceramic media balls, or nothing, or other filter media.It can be sucked tightly around the fish tank or the bottom without sand. 5. Suitable For Saltwater or Freshwater: Bio ceramic media balls with a layer of protective powder,it was normal.Before use, please clean the sponge and ball with the water in the fish tank before putting it in the fish tank. Specifications: 1. Material: plastic & Sponge Caution: 1. Pleasec clean the sponges first before you put them into your aquarium.