The 50 hp Turbo X-Treme Magnum floating/surface aerator from Airmaster Aerator can pump 12.5 mgd. In operation, it raises the dissolved oxygen level in the water (in ponds, lagoons, etc.) while providing high-capacity water movement. An optional chemical injection port for adding enzymes and defoamers is available. Constructed of stainless steel, the unit is built for reliable, long-term operation. 888/813-3680; www.airmasteraerator.com.