Across: |
| 6. | Chemical symbol for sodium |
| 7. | Chemical symbol for iron. |
| 8. | A chemical commonly used for coagulation in water treatment is. |
| 9. | Of intestinal origin, especially applied to wastes or bacteria |
| 10. | Temporary cloudiness in a freshly drawn sample of tap water may be caused by this. |
| 11. | A substance which is poisonous to a living organism is referred to as this. |
| 13. | An insect or other organism capable of transmitting germs or other agents of disease. |
| 15. | Water treatment chemical copperas is this. |
| 16. | Fluoride in excessive amounts causes this. |
| 17. | Methemoglobinemia is thought to be caused mainly by high concentrations of this. |
| 19. | A pH value of 7.0 is considered to be this. |
| 21. | Adsorption operates on the principle of this. |
| 22. | Chloramines are formed by the addition of chlorine and this. |
| 23. | Disease producing organisms are commonly called. |
| 25. | Liquid, raw or partially treated flowing into a basin, reservoir, treatment process, or treatment plant is referred to as this. |
| 26. | This is used in water to disinfect. |
| 27. | A solution or liquid whose chemical makeup neutralizes acids or bases without great change in pH. |
| 28. | The indicator methyl orange is used to test for this. |
| 29. | Intermittent releases or discharges of industrial wastes are referred to as these. |
