Our main residence has well water and over the years my highlighted blonde hair became pinkish and sometimes had an orange cast. I tried other shampoos for hard water, drained our water tank and had salon treatments; nothing helped to maintain my blonde highlights as well as Malibu C Hard Water Wellness Shampoo. Malibu C Hard Water Wellness Shampoo keeps my hair blonde (and not pink-orange) until my next salon visit. The product is wonderful if you are blonde and have well water. Thank you so much!