For vessels, which mostly cruise on inland (fresh) waters, we recommend aluminium anodes, since aluminium has a greater difference of potential with other metals than zinc. This is very important, as fresh water provides a higher electrical resistance than salt water. For sailing on salt water or brackish water, we recommend the use of zinc anodes. Aluminium anodes also function well in salt water, but are sacrificed at a much faster rate. We do not recommend the use of magnesium anodes, as the difference of potential with other metals is too great, which could cause damage to the hull paint, especially when sailing in brackish or salt waters.