EcoBlox water matrix allows for thirty-one and a half gallons of water storage for pond-free applications, bog filters and water harvesting, Atlantic"s EcoBlox is the newest and most effective water matrix available today, Ships in 8 panels, slide and lock assembly required, Holds 4 times more water than traditional gravel basins, Compression test held up to 14,466 pound load, 8 panel construction for exceptional strength, 1/2"" x 3/4"" hole size can be used with smaller gravel, Dimensions: 16"" W x 27"" L x 17, 5"" H, Capacity: 31, 5 gallons, SKU: ATLWG240