2 Versions (2K & 4K): up to 1849 GPH & up to 3962 GPH.For Saltwater & Freshwater Aquariums.Maxspect Jump Gyre Flow Pumps are the latest offering from Maxspect. This latest Gyre is fully programmable and utilizes crossflow technology to distribute flow evenly and eliminate dead spots. Unlike earlier versions, each Jump Gyre comes with its own controller. They also come with an extra set of black rotors.