White marks on washed clothes are often caused by using too much soap powder or by detergents not fully dissolving. After treatment with a Dyna Pipe water descaler, hard-water behaves like soft water and will not only leave clothes cleaner, brighter and softer, but also less soap powder will be required to produce a good lather. Soap powders will fully dissolve in soft-like water and so white marks on washed clothes will be a thing of the past.