Feature: 1. FINE BUBBLES: The bubble wood of the protein skimmer is made of premium lime wood with many microscopic small holes, which has low resistance and produces very small and uniform bubbles. 2. WORKING PRINCIPLE: Aquarium protein skimmer uses the principle that the surface of bubbles in water can adsorb various granular dirt mixed in water as well as soluble organic matter. 3. EFFICIENT: The use of oxygenating equipment or vortex pump to generate a large number of bubbles, the formation of foam adsorption of dirt, will be collected in the container on the water surface, into a cloudy liquid is removed. 4. NO NEED FOR PUMP: Fish tank pneumatic protein separator, no need for pump, to ensure water clarity, high oxygen content. Stable and energy saving, can be used to increase the dissolved oxygen in the water. 5. PREMIUM MATERIAL: The body of this aquarium protein filter is made of premium acrylic material, with clear vision and strong and durable structure. Suitable for most seawater tanks. Specification: Item Type: Aquarium Protein Skimmer Material: Acrylic, Lime Wood Assembly Height: Approx. 29.5cm / 11.6in Use: Pneumatic Protein Filter Applicable Fish Tank Wall Thickness: Within 5mm/0.20in. Package List: 1 x Aquarium Protein Skimmer1 x Cover1 x Hose1 x Control Valve1 x Check Valve1 x Fixed Frame Note: Manual measurement, please allow some errors.