The Reef Octopus Classic 150SSS Protein Skimmer supplies powerful filtration for aquariums up to 210 gallons where sump space may be limited. The Reef Octopus Classic 150SSS is constructed of high-quality acrylic that can be completely disassembled for cleaning. Equipped with the new Aquatrance pinwheel pump, it produces an ideal mix of water and air for optimum waste removal. A simple vented wedge valve output provides precision control and allows cleaned water to exit the skimmer below water for quiet operation.