Features: 1. Made from high quality plastic material, which is sturdy and durable. 2. Equipped with the suction cups to ensure the installation of product stable. 3. It will achieve better results, when combined the biochemical, sponge and physical filtration. 4. Removable, washable, you can replace the filter cotton. 5. Two size to choose from, easier to decide which one suit for you best. Specification: Condition:100% Brand New Material: plastic Color: As Pictures Shown Type: LH300, LH600(Optional) Size: LH300: 189*67mm/7.4*2.6in(H*Bottom Dia) LH600: 224*79mm/8.8*3.1in(H*Bottom Dia) Package list: 1 * Filter 4 * Suction Cup How to install: 1. Use air pipe to connect the product with air pump. 2. Plug in the air pump, if the water outlet come out water or bubble, means it is under normal operation. If the air pump is lower than water, please install check valve. Note: 1. The fluidized bed is floating at the beginning, and it needs to be soaked in water for 1-2 days to achieve suspension and tumbling. 2. It should be combined with air pump .