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Across 3. BOD 8. Disinfection 9. Ammonia 10. Coagulants 13. Collection 14. Nitrates 17. Filtration 18. Gasoline 19

Down 1. Ultraviolet 2. Arsenic 4. Ozone 5. Drycleaners 6. Sedimentation 7. Hydrologic 11. Secondary 12. Aeration 15. Fluoride 16. Potable 19. Calcium 20. 0.02 23. Floc. Across 3. BOD 8. Disinfection 9. Ammonia 10. Coagulants 13. Collection 14. Nitrates

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Across 3. BOD 8. Disinfection 9. Ammonia 10. Coagulants 13. Collection 14. Nitrates 17. Filtration 18. Gasoline 19

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  1. Down 1. Ultraviolet 2. Arsenic 4. Ozone 5. Drycleaners 6. Sedimentation 7. Hydrologic 11. Secondary 12. Aeration 15. Fluoride 16. Potable 19. Calcium 20. 0.02 23. Floc Across 3. BOD 8. Disinfection 9. Ammonia 10. Coagulants 13. Collection 14. Nitrates 17. Filtration 18. Gasoline 19. Cations 21. Chemical 22. E.coli 24. Aquifer 25. Mercury For more lessons, visit www.chalkbored.com

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