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Disinfection and Sanitizers Questions and Answers Flashcards

6 cards from real CPO practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 6 Disinfection and Sanitizers Questions and Answers flashcards as text

  1. What is the primary advantage of using bromine instead of chlorine in hot tubs and spas?

    Answer: Bromine remains effective at higher temperatures and wider pH ranges

    Bromine is more stable at the elevated temperatures found in spas and remains effective across a wider pH range compared to chlorine.

  2. What is the purpose of an ORP controller in a pool sanitization system?

    Answer: To continuously monitor the sanitizing power of the water and adjust chemical feed accordingly

    ORP controllers measure the water's oxidation potential in millivolts, providing real-time indication of sanitizing effectiveness.

  3. How does a salt chlorine generator produce chlorine for pool sanitization?

    Answer: By electrolysis of dissolved sodium chloride in pool water

    Salt chlorine generators use electrolysis to split dissolved sodium chloride into its components, producing hypochlorous acid.

  4. What is the primary concern with using chlorine dioxide as a pool disinfectant?

    Answer: It forms harmful chlorite and chlorate byproducts that must be carefully monitored

    Chlorine dioxide produces chlorite and chlorate byproducts that are regulated by the EPA due to health concerns.

  5. What is the recommended contact time for free chlorine at 1.0 ppm to achieve 99.9 percent inactivation of Giardia at 77 degrees Fahrenheit?

    Answer: About 15 minutes at pH 7.5

    At 1.0 ppm free chlorine and pH 7.5 at 77 degrees Fahrenheit, approximately 15 minutes of contact time is needed for 3-log inactivation of Giardia.

  6. Why is it important to use a DPD test kit rather than OTO for measuring chlorine in public pools?

    Answer: DPD measures both free and total chlorine separately while OTO only measures total chlorine

    DPD reagents can differentiate between free chlorine and total chlorine, allowing operators to calculate combined chlorine. OTO only measures total chlorine.