What is the primary role of sacrificial anodes in water tanks?

The primary role of sacrificial anodes in water tanks is to prevent rust and corrosion. Sacrificial anodes are typically made from metals like zinc, magnesium, or aluminum, which are more reactive than the metals used in the tank itself, usually steel. When submerged in water, the anode corrodes instead of the tank materials, effectively protecting the tank from oxidative damage. This is a crucial process because it extends the lifespan of the water tank by mitigating the effects of corrosion, which can lead to leaks and structural failures.

The other options, while related to different aspects of water treatment and storage, do not accurately represent the function of sacrificial anodes. For instance, improving water taste and enhancing filtration focus on water quality rather than the structural integrity of the tank, and maintaining chlorine levels pertains to disinfection processes rather than corrosion prevention. Thus, the effectiveness of sacrificial anodes primarily lies in their ability to act as a protective measure against corrosion, ensuring the longevity and functionality of water tanks.