GE Merlin RO System Overview Aquaman features the GE Merlin reverse osmosis system. The Merlin is a tankless continuous production system capable of producing 750 to 1000 gallons per 24 hour day with a very low 2 to 1 waste water rejection ratio, making it a very efficient system. It is technically a residential system, but capable of handling light commercial applications. They are popular with hydroponic gardeners and maple syrup manufacturers. Aquaman is a Water Quality Association Certified Water Specialist. His training and experience have given him a deep understanding of water chemistry and water purification equipment. This enables him to provide scientifically accurate information that you can trust!