LOA (Length Over All) is the length of your vessel in feet, this distance is used to calculate your service amount.
It is usually a monthly service but can also be every 2 or 3 months.
The sacrificial anodes installed on your boat protect your metal parts in the water from galvanic corrosion.
In a galvanic reaction, how fast a metal corrodes in relation to another depends on where the metals are located on the nobility scale. The nobility scale ranks the relative ease that materials are corroded when in a salt bath. Active metals, like zinc are at one end of the scale and “noble” or inactive metals like gold, are at the other, the passive end. In simple terms, installing an anode on the shaft will protect the propeller from damage by sacrificing itself in place of the propellor.
When dissimilar, electrically connected metals are immersed in an electrolyte (usually saltwater) an electro-chemical reaction occurs which begins to corrode or “eat away” one of the two metals. The end result of this process is referred to as galvanic corrosion. Many people wrongly refer to this process as “electrolysis”.
Because boats tend to have many underwater metal surfaces (outdrives, thru-hull fittings, propellers, etc.) and because many are “wet stored” in the water, galvanic corrosion
The most common sacrificial anodes are made of zinc or aluminum in a salt water environment.
It varies greatly based on your boat and where it is located in the harbor. Usually it is replaced 2-3 times a year.
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