We've been in brackish water for nearly nine years (Napa River confluence with Carquinez Strait, San Francisco Bay Area). I consider it a plus as opposed to pure ocean water closer to San Francisco. We have reduced marine growth between hull cleanings as well as reduced electrolysis.
Consult with a marine corrosion control expert as to what type of "zincs" to use in your area. Some say aluminum are better than zinc in brackish conditions.
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Ray
"Mahalo Moi"
1986 GB-42 Classic
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