Coralife DC Wavemaker Pulse, 2-Pack Eliminates dead zones Improves water quality and coral health For use in salt and freshwater environments 2,600-GPH Limited lifetime warranty Create customize water patterns similar to reef currents and flows Four operational modes including continuous flow mode, tidal mode, turbulence mode and continuous/turbulence mode Eliminates dead zones and improves water quality and coral health For use in both salt and freshwater environments