AlphaONE MegaSystem 3 is the latest innovation from GCTek, the recognized leaders in Koi pond filtration. These world-class pond filtration systems provide complete biological and mechanical filtration for Koi ponds up to 25,000 gallons! Everything on the MegaSystem 3 is 3" -- not 2" like most systems on the market today. If your goal is to move lots of water with minimal energy usage, the MegaSystem 3 is the system for you! Each MegaSystem 3 comes with your choice of an AlphaONE or AquaBead 9.3 LH Filter, 3" PerformancePro Artesian Pro Pump 3/4-112 Low RPM Pump, and Zapp Pure 40 UV Sterilizer, and 3" stainless steel pre-filter. All equipment is preplumbed and mounted on two all-weather pads measuring 36" x 96". A variety of pumps are available for these systems to help suit your specific needs.