Atlantic Eco-Blox Water matrix blocks installed in-lined excavations create weight-bearing underground water storage reservoirs Save labor, time, and money on Pond-free, rainwater harvesting, and stormwater management installations versus gravel-filled reservoirs Eco-Blox lock together quickly and securely, easily supporting landscaping, pavers, gravel, or sod for great design versatility Arrange modular blocks in any configuration and any number of levels to accommodate almost any basin Excellent for bog construction to create settling chambers below natural plantings of active bog filters Atlantic's Eco-Blox are the strongest water matrix blocks available, capable of supporting over seven tons of distributed load With 96% voice space, Atlantic's Eco-Blox hold more water in a smaller volume, reducing the overall size of the basin Product Details: Model: ECOBLOX Item: 73234 Capacity: 31½ Gallons Application: Pond-free / Fountain / Rain Harvesting Warranty: 1 Year Dimensions: 27"L x 16"W x 17½"H