Hard water is considered quite harmful to hair health as the mineral/chemical deposits it leaves behind create a film on your scalp and strands. This film prevents moisture absorption and causes the hair to become dull, dry, and tangled, which can lead to increased hair fall. It also reduces the effectiveness of the products you're using and can even affect hair color. We generally recommend installing a water filter to limit the amount of minerals being deposited onto your scalp and strands!