Coated Zinc threaded rot ... used as one pole. Thicker zinc would be good since zinc will get absorbed by the earth over time.http://algo.mur.at/projects/powerflowerbells/media/earth_battery_2/small_pot_zinc_coated_%20threaded_rod.jpg/viewhttp://algo.mur.at/projects/powerflowerbells/media/earth_battery_2/small_pot_zinc_coated_%20threaded_rod.jpg/@@download/image/small_pot_zinc_coated_ threaded_rod.jpg
Coated Zinc threaded rot
... used as one pole. Thicker zinc would be good since zinc will get absorbed by the earth over time.
