What chemical is commonly used to reduce corrosivity in water?

Calcium hydroxide is commonly used to reduce the corrosivity of water due to its ability to increase the pH level. When the pH of water is low, it can be corrosive to pipes and plumbing systems, as it tends to leak metal ions into the water supply. By adding calcium hydroxide, the pH elevates, making the water less acidic and therefore less corrosive.

In addition, calcium hydroxide also reacts with carbon dioxide in water to form calcium carbonate, which can further help in creating a protective scale on the interior surfaces of pipes, thereby enhancing corrosion resistance. This process not only stabilizes the water but also helps to maintain the integrity of water distribution systems over time.