Feature: 1. The new V1 filter material can be attached with various microorganisms on the surface. Through continuous rolling, the filter material can collide with each other, playing the function of selfrepair and regeneration of the filter material without changing the filter material. 2. Our filters are equipped with suckers to make sure a stable installation of the product, easy to install and disassemble, so they can be used wherever needed. 3. It is equipped with detachable filter cotton, which can be easily replaced to solve the cleaning problem more easily. 4. Imitating the natural riverbed, sand and gravel roll along the riverbed with the water, play a role in the purification of water quality. 5. This fluidized bed filter fits for both fresh and saltwater tank, perfect to be used for all types of tanks. Specification: Condition: 100% Brand New Item Type: Fluidized Bed Filter Material: Plastic Color: As Pictures Shown Suitable Type: Aquarium Fish Tank . Package List: 1 x Fluidized Bed Filter4 x Suction Cup Note: 1.If the air pump is below the water surface, please install a check valve 2.Fluidized bed filter material is floating at the beginning, need to soak water 12 days to achieve suspension rolling