Hard water is a very serious concern for your dreads that many people are unaware of. Hard water is simply water that contains minerals and heavy metals. It can drastically reduce the cleaning capacity of your shampoo, it can lead to changes in the color of your hair, and ultimately contribute to an oily greasy scalp. If you can afford a water softener system for your home that is your best option. A simpler solution is using a shampoo designed for hard water and/or rinsing with an ACV rinse after every wash plus doing a deep cleanse quarterly.