What is the effect of hard water on hair?

Hard water contains high levels of minerals, particularly calcium and magnesium, which can lead to several negative effects on hair. When hair is exposed to hard water, these minerals can accumulate on the hair shaft, causing buildup that interferes with the hair's natural sheen and texture. This buildup can make hair appear dull and lifeless, as it prevents moisture and oils from effectively penetrating the hair cuticle. Over time, this can lead to hair that is harder to style and manage, resulting in a lackluster appearance. Thus, the impact of hard water on hair primarily manifests as a decrease in vibrancy and health, which aligns with the correct understanding of the situation.