Across
- 2. the build up found on bathroom tiles and shower screens
- 8. a method of separating a mixture by their boiling points
- 9. the name of the salt crystals that form permanent hard water
- 11. from the atmosphere reacts with limestone to form hardwater
Down
- 1. hardwater caused by hydrogen carbonate ions
- 3. the third stage of purifying water
- 4. the build up found in washing machine
- 5. killed during chlorination
- 6. the stage of purifying water that removes large insoluble particles
- 7. an ion that makes water hard
- 10. hardwater caused by sulfate ions