Across
- 5. is present in calcium sulphate.
- 9. it's really hard to get off.
- 10. contains Mg2+, Ca2+, Na+ and K+.
- 11. this slows down the flow of the water.
- 13. water that's unhealthy to drink.
- 14. the common name for calcium sulphate.
- 15. is injected into the water to sterilise it
- 16. water that is safe to drink.
- 17. contains magnesium ions and calcium ions.
Down
- 1. can make water harmful
- 2. removes smaller insoluble particles.
- 3. is a source of water.
- 4. contains dissolved ions+ microorganisms.
- 6. it is calcium carbonate.
- 7. a substance in water.
- 8. it can block pipes and damage equipment.
- 11. doesn't make bubbles with hard water.
- 12. contains dissolved CO2 and O2.