Quantity:1 Feature:1.biochemical cotton can be replaced regularly, cleaning regularly, and reused after disassembling and cleaning.2.Simple, connect the air pump, place it in the fish tank, Can be used in conjunction with barrels, plug -in, and upper filters for prefabricated exquisite filtration.3.Built -in gas bubbles, mute work, no noise, saving electricity.Specifications:Size: Bottom Diameter 8.0cm x height 8.5cm/3.15"x3.35"Package Included:1X Mini Aquarium Sponge FiltersNote:1.Please allow 1-2cm measuring deviation due to manual measurement. 2.Due to the different monitor and light effect, the actual color of the item might be slight different from the color shown on the pictures. Please Understand, Thanks! High Performance: This filters multiple simulation of nature filtering, both physical and biochemical filtration increased the amount of soluble oxygen in the fish tank water Maintain Water Stability: High power, no noise, improve soluble oxygen in water, combined with mechanical filtration and biological filtration principles, use multi -layered filtering to cultivate high -density nitrifying flora to achieve clean and good water quality stability. Reasonable Design: Multi -layer beach design can be cleaned in order, nitrifying bacterias will not be lost, and the moving cylinder does not affect the water quality. Dual Effects: Dual filtration of physical and biochemicals, cotton filtering impurities, circulating filtering, purifying SHOP WITH CONFIDENCE: To provide you with the highest quality service, If you have any question, please feel free to contact us.We will provide after-sales service until you are satisfied. See more product details High Performance: This filters multiple simulation of nature filtering, both physical and biochemical filtration increased the amount of soluble oxygen in the fish tank water Maintain Water Stability: High power, no noise, improve soluble oxygen in water, combined with mechanical filtration and biological filtration principles, use multi -layered filtering to cultivate high -density nitrifying flora to achieve clean and good water quality stability. Reasonable Design: Multi -layer beach design can be cleaned in order, nitrifying bacterias will not be lost, and the moving cylinder does not affect the water quality. Dual Effects: Dual filtration of physical and biochemicals, cotton filtering impurities, circulating filtering, purifying SHOP WITH CONFIDENCE: To provide you with the highest quality service, If you have any question, please feel free to contact us.We will provide after-sales service until you are satisfied.