Examples from the Web for hard water
Every drop of hard-water we consumed had to be brought to our doors and paid for by the “Hessian” or bucket.Recollections of Old Liverpool|A Nonagenarian
These crispy croutons answer as a substitute for hard-water crackers and are also relished by most people.The Whitehouse Cookbook (1887)|Mrs. F.L. Gillette
A French commissioner reported that apparently people in hard-water districts had a better physique than in soft-water districts.Rural Hygiene|Henry N. Ogden
Culture definitions for hard water
Water in which dissolved minerals make it difficult to produce a lather with soap.