We started 10 years ago with an 11x16 standard koi pond with 6 ft high waterfall, and eventually converted it to pondless by repositioning the pump and filling the basin with boulders. We just got tired of cleaning up the pond! We now have a 6x6x2 ft pondless reservoir filled with cobble at the base of a 4 ft high brook-type waterfall, located in Morgan Hill, CA. Our pump is an Aquascape Designs 3500 gpm housed in a small snorkel box. The original 11x16 was installed for us, but we converted that one to pondless and built the pondless waterfall in this house ourselves, so we are fairly experienced with the elements involved.