What system protects against corrosion within water storage tanks?

The correct choice is cathodic protection, which is a vital system used to prevent corrosion in metal structures such as water storage tanks. Corrosion occurs when electrochemical reactions take place between the metal and the environment, often exacerbated by moisture. Cathodic protection works by involving an electrochemical cell where the structure requiring protection is electrically connected to a more anodic material (often a metal like zinc or magnesium). This setup causes the sacrificial anode to corrode instead of the protected metal, effectively slowing down or even halting the corrosion process.

This system is particularly useful because it not only helps in maintaining the integrity of the storage tanks but also improves the overall longevity and safety of the water supply. By minimizing the risk of leaks and contaminants stemming from corroded materials, cathodic protection is essential for ensuring clean and safe drinking water.

In contrast, filtration systems are primarily designed to remove particulates and impurities from water, while water softening focuses on removing calcium and magnesium ions to prevent scale build-up. Corrosion inhibitors, although effective in certain applications, typically work by creating a protective chemical layer on the metal surfaces rather than the active electrochemical process seen in cathodic protection.