For earthing solutions, the purity and quality of materials have a very big influence on long-term performance and safety. A copper bonded earthing rod is designed with a steel core that is molecularly attached with a high-purity copper layer. The standard of purity for copper in such rods is usually 99.9% or better and is often called out as electrolytic copper. This high purity c... https://www.pioneerpowers.com/copper-bonded-earth-rod.php