Nelson Water Gardens Disappearing Fountain Reservoirs are designed and manufactured in the U.S.A! They come in three sizes to fit almost any application (2'x2', 3'x3', and 4'x4'). Square reservoirs hold 27% more water and have 27% more surface area than circular reservoirs, thus giving you more volume. Square reservoirs have a larger splash zone and offer greater flexibility. This means you have to refill them less often, and are less likely to burn up the pump.