Which component is typically added to well water systems to prevent contamination?

In well water systems, employing filtration systems is vital for preventing contamination. Filtration systems are designed to remove or reduce contaminants such as sediments, bacteria, chemicals, and other impurities that may be present in the water. By utilizing various types of filters (such as sand filters, carbon filters, or reverse osmosis systems), these systems ensure that the water is not only safe to drink but also meets health and safety standards.

While chlorine is used in some cases to disinfect water, it doesn’t specifically prevent initial contamination from the source; rather, it serves as a treatment method post-contamination. Calcium, primarily associated with water hardness, doesn't contribute to contamination prevention, and deionizers target specific ionic contaminants but may not address a broader spectrum of potential water quality issues found in well water. Thus, a filtration system is the most comprehensive approach among the options for ensuring well water remains clean and safe for consumption.