All-in-One Koi Pond Aerator for Outdoor Ponds up to 2000 Gallons, Pond Air Pu...
All-in-One Koi Pond Aerator for Outdoor Ponds up to 2000 Gallons, Pond Air Pump Pond Aeration System with 4-Outlet Airline Tubing Air Stones Check Valves. Why do you need the aeration?. Supports vibrant coloration and active behavior in koi.