Mars One Mission; Water

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Across
  1. 3. Tasting of, containing, or preserved with salt
  2. 5. A chemical compound compose of 2 oxygen atoms and 1 carbon atom
  3. 10. Dirt
  4. 13. A covering of ice over a large area
  5. 15. A solid inorganic substance of natural occurrence
  6. 16. Ocean
  7. 17. Salts derived from perchloric acid
  8. 19. Remove contaminates from, to cleanse
  9. 20. Waste water and excrement conveyed in sewers.
Down
  1. 1. Electricity created by hydropower
  2. 2. A substance capable of causing death
  3. 4. A porous device for removing impurities or solid particles from a liquid or gas passed through it
  4. 6. Engrossed
  5. 7. The planet we live on
  6. 8. Having the properties of an acid, or containing acid, having a pH below 7
  7. 9. Chemical element with symbol O and atomic number 8
  8. 11. To use again
  9. 12. The fourth planet from the sun
  10. 14. Turned from liquid into vapor
  11. 18. Convert waste into reusable matter