water quality

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Across
  1. 3. a tool that measures water clarity (2 words)
  2. 6. trace elements that can be toxic in small amounts
  3. 8. H2O molecule
  4. 9. the amount of oxygen in water (2 words)
  5. 10. a process using evaporation to clean water
  6. 11. the amount of salt in water
  7. 12. a process of passing water through layers to clean it
  8. 13. a measure of water clarity
  9. 14. an element in fertilzer that causes algal blooms
Down
  1. 1. a measure of pH
  2. 2. cause "blue baby" syndrome
  3. 4. the amount of suspended sediment (3 words)
  4. 5. insects
  5. 7. a process that makes fresh water from salt water