The pond is over 20 years old now, 30 feet in length, 7000gallons in volume which is turned over by one Aquamax 16000 serving the skimmer / waterfall and a Aquamax 12000 for the filtration system that consists of 6 settlement chambers then a Nexus 300 and the easy. Aeration is two hiblows serving 8 large stones in the pond and one hiblow serving the Nexus. The set up also boasts a separate 900 gallon quarantine system set in a Japanese style garden most of the Koi that are housed in the pond were purchased from "Taunton Koi" and Worthing aquatics.