ADS 2412BD Arc-24 Septic Leaching Chamber - The Arc-24 Septic Leaching Chamber is a sturdy, lightweight plastic unit that combines maximized infiltrative surface area and storage capacity with an improved structural design. This unique combination allows for increased effluent dispersal and improved structural integrity as well as ease of installation and simplified contouring capabilities. Leaching chambers are rapidly becoming the product of choice for leach field applications over conventional pipe and gravel systems.