Blue Thumb Serenity Water Garden KitThe Pond Builder Serenity pond kit works best for ponds up to 1,000 gallons of water. Waterfall biologically filters and aerates the water make the pond safe for fish, as well as keeps the pond water clear and clean. The skimmer that is included skims the debris from the pond before it can settle on the bottom, helping eliminate sludge. There are two kit sizes available: 6' x 8' and 8' x 11'. Included in the 6' x 8' Kit: supports up to 550 gallons