Color Wow Dream Filter's breakthrough technology works like a magnet to remove metals and minerals from hair in under 3 minutes - no heat, cap or mixing required. Metals and minerals found in tap and well water build up on hair, leaving behind a film that dulled, darkened and stains colour - making the texture feel rough. Metals (like copper) also act as catalysts to developers, which can lead to unpredictable colour processing results and cause damage. Dream Filter Pre Shampoo Spray eliminates these environmental elements that wreck colour, and leaves hair fresh, light and bright with a safe, non-harsh and non-stripping formula. Use Dream Filter before a lightening service, during a single process, prior to styling, when caring for extensions and between salon appointments.