Aquascape Waterfall Pumps. If you already own or plan on building a Pondless® Waterfall, you want to select a pump with adequate flow for the length and width of your waterfall or stream. The length of pipe from your pump to the waterfall also has an impact on how many gallons per hour (gph) your pump needs to push. Your waterfall pump will be placed inside the waterfall vault. protecting the pump and helping to increase its lifespan. Aquascape offers two styles of waterfall pumps: solids-handling and energy-efficient pumps. Pond Pumps are ideal for use in pond skimmers and Pondless® Waterfall Vault applications. Follow our three steps below to help choose the right waterfall pumps