Zinc anodes are the cheapest insurance on your boat. They corrode instead of your shaft, prop, rudder and other underwater metal. Let them disappear and the saltwater goes after the expensive parts next. Here is how often to replace them in Miami’s water.
The simple rule: replace at 50%
Replace an anode once it is about 50% depleted. In Miami’s warm, salty water that usually means every 4 to 6 months — sometimes faster on boats plugged into shore power or sitting in a busy marina with stray current.
Signs your zincs need replacing
- The anode looks pitted, crumbly, or half its original size.
- White/green corrosion starting on the prop, shaft or trim tabs.
- It has simply been more than ~5–6 months since the last change.
Our divers inspect your anodes on every hull cleaning and tell you exactly what’s left, so you never have to guess.
Why Miami eats zincs faster
Three things speed up anode wear in South Florida: warm water (more conductive), high salinity, and stray electrical current from nearby boats and dock wiring. That is why a Miami boat often needs zincs more often than the same boat up north.
What gets protected
A typical service covers shaft, propeller, rudder, trim-tab and sometimes hull/keel anodes. We carry the common sizes and replace them underwater at your slip — no haul-out. See our zinc anode replacement service for details, and pair it with routine hull cleaning to catch wear early.
Book your Miami hull cleaning
Aqua Pro has cleaned Miami hulls in the water since 2004, with a 5.0 Google rating. Message us on WhatsApp at (786) 756-0304 for a fast quote — most boats are scheduled within 24–48 hours, no haul-out, and you pay only after the job is done.
