BENA-GCL is selectively mined and processed high-quality sodium based bentonite powder to ensure a low permeability containment product ideally suited to applications of landfill containment. BENA-GCL is chemically modified bentonite powder which will generally give higher swell index values and lower fluid loss numbers when added with polymers. Generally, the calcium content must be kept to minimal levels as calcium montmorillonite has a much lower swelling potential than sodium montmorillonite. BENA-GCL does not contain any Fermentable Product and is Environmentally Acceptable.