hard water C3

it makes scum and scale...

• hard water won't easily form scum and scale with soap you get a scum instead
• hard water also forms furring of the pipes, boilers and kettles, this reduces the efficiency and may need to be replaced - costs a lot of money
• scale means that it takes longer to boil as it becomes a thermal insulator - becomes less efficient
• it also forms a scum on the surface of tea 

Advantages of this water

• calcium ions are good for bones and teeth
• it forms a protective coating inside pipes and protects…