Feature: 1. The bubble wood is made of super high‑quality lime wood with many tiny holes. The resistance of the material is very small, and it can produce very small and very uniform bubbles. 2. Under the premise of correct selection of the oxygen pump (under 5W), the product can produce a large amount of foam to separate impurities in the seawater. 3. Borosilicate glass is environmentally friendly and healthy. The hand‑made borosilicate glass is more resistant to cold and heat. 4. Practical fish tank accessory, clear view and strong structure, durable in use. 5. It can be used for protein separation to increase dissolved oxygen in water. Specification: Item Type: Fish Tank Protein Separator Material: Borosilicate Glass + Orange Wood Product Size: Upper Diameter: Approx. 8cm / 3.1in Lower Diameter: Approx. 4cm / 1.6in Total length: Approx. 26.5cm / 10.4in Weight: Approx. 166g / 5.9oz Fixing Clip Can Hold Glass: Approx. 5mm / 0.2in Functional Principle: The protein skimmer is based on the principle that the surface of bubbles in the water can absorb various particulate dirt and soluble organic matter mixed in the water. A large number of bubbles are generated by oxygenation equipment or vortex pumps. These bubbles are all concentrated on the water surface to form bubbles, which will adsorb The dirty foam is collected in a container on the surface of the water, and it will turn into a turbid liquid and be discharged.. Package List: 1 x Protein Separator1 x Accessories Bag Note: 1. This product must be driven by an air pump; please purchase separately, 5w is recommended2. Do not use an air pump that is too large, which will cause the air wood to loosen! If it is loose, just roll the air head with a layer of water tape and put it back in.3. In order to ensure that the protein skimmer maintains an ideal operating state, it is necessary to pay attention to the amount of bubbles generated regularly. We recommend replacing the bubble wood every 2‑3 months.