Carbofill is a low resistance high conductivity carbon based backfill material, which dramatically lowers ground resistance system in difficult soil conditions. JK Carbofill contains no bentonite or concrete components, which in very dry conditions can cause shrinkage around the electrode, thus rendering it ineffective. During construction, gelling liquid penetrates into soil and thus forming a conductive layer contacting with the electrode closely. Therefore, the effective contact area between the electrode and compound layer are increased and the contact resistance between them is reduced, which is beneficial to current discharge and resistance reduction. The natural features of strong absorbent and moisture retention keep the soil moist for a long time, and reduce the surrounding soil resistance so that the contact resistance between the soil and core of the electrode.