Water Quality & Management

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Across
  1. 7. The process of maintaining a safe water supply
  2. 9. Water that contains less salts than hard water
  3. 10. Sensitive or important species whose numbers can show the health of an ecosystem
  4. 12. A process which may be used to desalinate water by pumping water through filters
Down
  1. 1. Safe to drink
  2. 2. Wastewater from a septic tank; liquid industrial waste
  3. 3. A method of separating the parts of a liquid mixture
  4. 4. Large underground container that stores sewage
  5. 5. Poisonous substances
  6. 6. Water that contains large amounts of dissolved salts
  7. 8. Waste materials that pass through sewers
  8. 11. The diffusion of a solvent, usually water, through a selectively permeable membrane