High Potential (HP) Cast Magnesium anode is the best choice for CP systems in high resistivity soil, while Normal Potential (H1) Magnesium anode is the best choice for CP systems in low resistivity soil.
Normal Potential (H1) Magnesium4. Therefore, the driving potential of the H-1 cathodic protection anodes exceeds that of aluminum or zinc, but is still lower than a high potential magnesium anode.
Chemical composition of H1 Mg anode,
Total of Impurities