Use Magnesium anodes for fresh water applications. For salt or brackish water use Zinc anodes.
Magnesium Pencil anodes as seen below are also available in 1/2"NPT 3/4"NPT 1" NPT 1 1/4" NPT 2" NPT, Please call with desired length and quantity so we can get you a quote. 1-800-779-1102
