Certified Pool Operator Handbookpractice Test - 2017 84 Correctly Answered Questions Latest Update

104. To destroy harmful organisms in pool water, the accepted minimum of free chlorine is ____ ppm and many health codes set the maximum FC at ppm. {Ans: 1, 5}48. What is considered the necessary backwash rate to achieve proper agitation when backwashing sand filters? {Ans: 15 gpm/sf}"13. You are the CPO for a large municipal swimming pool. This pool has a volume of 560,000 gallons of water,and has an average daily bather load of 1300 people. The pool is operated using high rate pressure sand filters. How often should you backwash the filters?" {Ans: When the influent and effluent gauges are 10 to 20 psi apart}78. The addition of Trichlor Tables to a swimming pool has what effect of the pH level? {Ans: lowers pH}2. Assuming that your local health department requires you to raise the free chlorine to 5 ppm, how much sodium hypochlorite would be needed to raise the free chlorine in the pool in question #1 to that level? {Ans: 3.5 gallons}41. What effect does gas chlorine have on pH in water? {Ans: lowers}