Select the correct answer from the drop down box which follows each question. 
When you are finished , click the "submit quiz" button to check your answers.

1. The efficiency of the water aeration process depends on what?
   
   a. The amount of pressure in the air before it is added b. The amount of surface contact between the air and water c. The pH of the water before aeration
    

2. True or False:  Hydrogen Sulfide gas can be dangerous if inhaled in even low concentrations?
   
   a. True b. False
    

3. Methane gas can be removed in water by what method?
   
   a. Filtration b. Burning c. Aeration
    

4. What mineral is found in water that causes blackish staining of fixtures?
   
   a. Manganese b. Iron c. Rock salt
    

5. What is the oldest type of aerators?     
   
   a. Cascade aerators b. Cone aerators c. Slat and coke aerators d. Draft aerators e. Spray aerators
    

6. When a person or water article talks about VOC chemicals in water, what does the letters VOC stand for?
   
   a. Very Ordinary Chemical b. Volatile Organic Chemicals c. Very Old Chemicals
    

7. True or False:   There is more dissolved oxygen in cold water than in warm.
   
   a. True b. False
   
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