EEI provides H-1 magnesium anodes for use in low resistivity soils. These anodes are furnished in 1, 3, 5, 9, 17, 32, and 48 pound sizes. H-1 anodes are usually packaged with a back fill consisting of 75% gypsum, 20% bentonite and 5% sodium sulfate and with a ten foot #12 AWG lead wire or customized to your size and color specification.