Gyre 350 Double (2 pump + 1 controller)MaxSpect Gyre Flow Pump 300 seriesGyre Flow Pump 300 series XF350 Double (Comes with 2 pump and 1 controller) SINE WAVE motor technology allows the 300 series to run at near silent levels. Improved motor magnet design and cable positioning. New Flow Director attachment that enhances water flow direction allowing more precision within the aquarium. The attachment also shields the cages and rotors from light slowing down algae growth and therefore