I purchased Malibu C Hard Water Wellness products on the advice of my stylist. We have well water and it was turning my natural blonde hair very brassy. After just one use, the difference was astonishing. My baby blonde color was instantly back! I wish I found out about it years ago, I wasn't even aware that the discoloration was from my hard water. I highly recommend this product. I am now purchasing the Malibu Blondes Wellness products since they are for natural blondes. I have every confidence that they will work just as well. Thank you for this wonderful product.