Zinc anodes are designed for salt water use. A Magnesium version should be used for fresh water. In brackish water an Aluminium version should be used. Anodes should not be mixed on any installation and should be inspected as often as possible, especially if the boat is in a marine environment with lots of shore power around. If the anode is worn by more than a third, it will need to be changed, due to its surface area being reduced.
Always use genuine OEM anodes to ensure maximum protection on Sterndrives, Saildrives and Propellers. Non OEM anodes never meet or exceed genuine Volvo Penta, Mercruiser, Quicksilver and Tecnoseal replacement anodes. We have seen counterfeit anodes on some web and auction sites. Remember, a Sterndrive is £10,000 and a saildrive around £6000 to replace, if your anodes are not of the correct Zinc mix and made to the manufacturers specifications.
If you are unsure as to the exact part or fitting you require, please call us before ordering on 01326 370060.