<p>Name: Date:</p><p>Homework Filtration</p><p>Instructions: Answer the questions inline below. Save the document with your last name in the file name. Submit the assignment through WebCT. See the instructions on the course website (www.agls.uidaho.edu/asm320). </p><p>1. List the 5 mechanisms by which particles are removed in a filter.</p><p>2. Which of the 5 mechanisms above refers to the particle being trapped because it is larger than the pore space?</p><p>3. Why is activated carbon used in filters? </p><p>4. Why is diatomaceous earth used in filters?</p><p>5. When might you decide to use a larger particle size in your filter media?</p><p>6. When might you decide to use a smaller sized particle in your filter media?</p><p>7. Why does a water plant always have more 4 or more filter units?</p><p>8. What must one do if the filter becomes clogged with particles?</p><p>9. How do you know if a filter needs to be backwashed?</p><p>10. What problems can develop if backwash rates are too high?</p><p>11. What problems can develop if backwash rates are too low?</p><p>12. What do you do with backwash water?</p><p>13. Why are particle counters used?</p><p>14. What is the difference between a turbidimeter and a particle counter?</p>