The Regal 300EXT External Protein Skimmer is an innovative, high-performance filtration system designed for large saltwater aquariums. This recirculating skimmer effectively removes dissolved organic waste from the water column, providing powerful and essential filtration to maintain pristine water quality for systems up to 700 gallons. Its advanced design ensures a cleaner and healthier aquatic environment by efficiently processing aquarium water. This skimmer is equipped with a new generation Reef Octopus VarioS-6S controllable Direct Current (DC) pinwheel pump, offering refined control over air and water flow rates with 5 distinct speeds. Unlike traditional AC pumps, this DC technology allows users to electronically adjust performance, enhancing efficiency and customization. Constructed from high-quality cast acrylic, the unit completely disassembles for thorough cleaning, and a float switch connection is included for added security. The Regal 300EXT is best suited for dedicated reef aquarists and hobbyists managing large saltwater aquariums up to 700 gallons (light bioload), 600 gallons (medium bioload), or 500 gallons (heavy bioload) who require absolute control and superior water purification. Its robust build, precise electronic adjustability, and ease of maintenance make it a premium choice for maintaining optimal reef health and clarity.