This is our 1st pond my wife and I built about 6yrs ago. It's heart shaped with a waterfall located at the bottom, where the little fishing boy sits and hangs his feet in. It's loaded with Koi and frogs. (2) pumps, a 2400 for the main filter, 1500 for the waterfall, (2) prefilters on each pump, and a trickel filtration system. The water is crystal clear all year round with your genral seasonal maintenace and periodicly topping off. We just love it, Thanks PondBiz!