Used as Earth Electrode Backfill Compound for reducing soil resistivity. Backfill Earth Enhancing Compound with Pre-Mixed Concrete enables electrical earthing system designers and installers to achieve permanent, stable and low resistance earthing solutions, even in difficult ground conditions when used as a backfill to enhance the effect of copper earth electrodes or earth rods. It is a granulated electrically conductive aggregate which replaces sand in mixes with cement, thereby providing electrically conductive concrete.