Earthing Compound is used as an earth electrode backfill to reduce soil resistivity by retaining moisture. The compound consists largely of sodium montmorillonite, which when mixed with water swells to many times its dry volume. It has the ability to hold its moisture content for a considerable period of time and to absorb moisture from the surrounding soil and from rainfall. It prevents earth electrode material against corrosion. Mix the compound with water in the ratio of 1:3 to form a gel.