Mil-Spec magnesium anodes are designed to provide superb corrosion protection for Mercruiser outdrives that operate in fresh water only. They are the strongest anodes available and should not be used in salt or brackish water.
Fresh Water Only
Which Anodes Should I Use — Zinc, Aluminum or Magnesium?
For Mercruiser boats with AC shore power connections and no galvanic isolation, use Chart Merc-A (pdf).
For Mercruiser boats with no AC shore power connections, or having AC shore power connections with galvanic isolation, use Chart Merc-B (pdf).
