What is the role of a suspended sacrificial anode in a tank?

The role of a suspended sacrificial anode in a tank is crucial for protecting the tank from corrosion. A sacrificial anode is made from a more active metal, such as magnesium or zinc, which will corrode preferentially to the tank material. When the anode is placed in contact with the tank, it will corrode instead of the tank itself, thus prolonging the life of the tank by preventing structural degradation due to corrosion.

This method of corrosion control is particularly important in environments where tanks are exposed to moisture, such as in water storage, because it helps maintain the integrity of the tank over time. When the sacrificial anode is consumed, it can easily be replaced, ensuring continuous protection. In contrast, the other options do not align with the primary function of a sacrificial anode. Increasing tank capacity, supporting the tank structure, or monitoring water levels do not pertain to the corrosion protection that a sacrificial anode provides.