[ReelMagic]

As you are in a salt environment I would ensure the Zinc's I use are 100% zinc meeting MIL SPEC A-18001K. Many on the market are a combination of several materials including Aluminum, magnesieum  & Zinc.. Although they are cheaper they don't provide the same protection.... Here's a link regarding the importance of using the appropriate zincs. ([Only registered and activated users can see links Click here to register]). As I live in NY and dock my boat (12 mo/year) in saltwater I have been using B&S Zinc's for more than 30 years with good success... They cost more than others but are well worth the extra money IMO.  I purchase them locally from Bossler & Sweezy Propeller shop and/or at Lighthouse Marine ([Only registered and activated users can see links Click here to register])..M2C