Certified Pool Operator's Final Exam 2024/2025 questions with 100% correct answers

The percentage of hypoclorous acid formation is most influenced by: - ANSWERS pH Pool painting is usually done: - ANSWERS Before opening in the spring When a pool is chlorinated with gas chlorine, the operator must also use: - ANSWERS Soda Ash The term "chlorine demand" refers to: - ANSWERS The amount of chlorine which will react with substances in the pool Re-circulation pumps used in swimming pools are the type called: - ANSWERS Centrifugal pumps Reversing the flow of water through the filters is called: - ANSWERS Backwash "Slurry feed" or "body feed" refers to: - ANSWERS Diatomite added during a filter run The term pH is determined by the concentration of: - ANSWERS Hydrogen ions Because carbonate ions combine with hydrogen ions, sodium carbonate will cause pH to: - ANSWERS Rise When enough chlorine is added to cause complete oxidation of all organic compounds, a sudden drop in residual chlorine may be noticed. The point at which this occurs is called the: - ANSWERS Break-point "Residual chlorine" refers to: - ANSWERS The amount left in the water after oxidation of organic material Which of the following is NOT considered a swimming pool disinfectant: - ANSWERS Chlorinated hydrocarbons When chlorine is used as a disinfectant for swimming pools, the form in which it's disinfectant properties are the greatest is: - ANSWERS Hypochlorous acid The chemical most commonly used to raise pH is: - ANSWERS Sodium carbonate An example of a chemical used to stabilize chlorine is: - ANSWERS Cyanuric acid The chemical reagent recommended by the health department to test chlorine residual in swimming pools is: - ANSWERS D.P.D. The chemical reagent used most often to test pH in swimming pools is: - ANSWERS Phenol red Considering all factors, which of the following would be the BEST range for pH in a swimming pool: - ANSWERS 7.2-7.8 The minimum turnover rate to obtain 100% clarity in a pool is: - ANSWERS Once in eight hours There is a noticeable odor of chlorine around your pool and bathers are complaining of eye irritation. Which of the following is most likely to solve the problem: - ANSWERS Break point chlorination As pH increases, chlorine effectiveness: - ANSWERS Decreases In a high-rate sand filter system, the tanks are backwashed: - ANSWERS All at once The baffle in the filter tank is there to: - ANSWERS Disperse water evenly over the surface of the filter media An access manhole is constructed on each tank in sand and anthracite filter systems: - ANSWERS All of the above A hair and lint strainer should be located: - ANSWERS Before the pump and before the filter Sodium hypochlorite used as a pool sanitizer also affects the water pH in the following manner: - ANSWERS Raises Chlorine gas will ________ the pH: - ANSWERS Lower DE systems should be turned off for a "rest": - ANSWERS Never If the filter run is started with clean filters, the difference between the influent and effluent gauges should be: - ANSWERS Very little Glass containers are: - ANSWERS Never allowed in the pool enclosure Which of the following factors would produce a greater consumption of disinfectant in a pool: - ANSWERS Bather load plus sunlight In a stabilized pool, the concentration of cyanuric acid should not exceed: - ANSWERS 100 ppm