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1. Iron and manganese can have adverse health effects on humans.
   
   a. True b. False
    

2. Iron bacteria which can be a product of high iron levels in a distribution system can be controlled by:
   
   a. Hydrofluorosilic acid b. Polymers c. Chlorination d. Flushing
    

3. What is the secondary standard set by the Safe Drinking Water Act ( SDWA ) for iron in parts per million
   
   a. .75 ppm b. .03 ppm c. 0.3 ppm d. 0.5 ppm
    

4. What is the secondary standard for manganese under ( SDWA )?
   
   a. 1.5 ppm b. 0.5 ppm c. .05 ppm d. 1.0 ppm
    

5. Polyphosphates are only effective in masking or (sequestering) iron and manganese in what chemical state?
   
   a. Ferrous and manganous b. Ferric and manganic
    

6. Polyphosphates are designed to sequester iron levels up to 1.0 part per million effectively.
   
   a. True b. False
    

7. Methods for controlling iron and manganese in the distribution system include which of the following?
   
   a. Searching for alternate water source b. Addition of polyphosphates c. Oxidation and removal of iron and manganese d. All of the above
    

8. The most common and affordable method for oxidizing iron and manganese before filtration is:
   
   a. Potassium permanganate b. Chlorine c. pH adjustment d. Aeration
    

9. Potassium permanganate would be the most effective oxidizing agent when you have high levels of:
   
   a. Iron b. Magnesium c. Manganese d. Calcium
    

10. Iron removal filters are designed to be backwashed based solely on headloss through the filter.
    
    a. True b. False
    
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