Up until recently, your only solution was to use a clarifying shampoo to get rid of the build up. But these formulas are harsh and can actually strip your gorgeous color from your hair. Sarah’s solution for dealing with hard water build up? Dream Filter. This breakthrough pre-shampoo treatment works like a magnet to gently lift minerals and metals off your hair and get rinsed away when you shampoo, revealing brighter, lighter color in three minutes or less. No chemicals, no dyes. Just a super gentle, healthy, easy-to-use spray with instantly brilliant results.