Certified Pool Operator Final Exam 2024 Expected Questions and Answers (Verified Answers)

whole range chlorine in a pool: ____ to _____ - ANSWERS 1, 5 ideal range chlorine in a pool: ____ to _____ - ANSWERS 2, 4 whole range chlorine in a spa: ____ to _____ - ANSWERS 2, 10 ideal range chlorine in a spa: ____ to _____ - ANSWERS 3, 5 4 types of solid chlorine - ANSWERS calcium hypochlorite, lithium hypochlorite, trichlor, dichlor liquid chlorine - ANSWERS sodium hypochlorite (NaOCl) how active is gas chlorine - ANSWERS 100% the active killing form of chlorine in water - ANSWERS hypochlorous acid (HOCl) HOCl = ______ - ANSWERS H+ (hydrogen ion) + OCl- (hypochlorite ion) most common granular chlorine (pH range) - ANSWERS calcium hypochlorite (8.5 - 11, used to super chlorinate water) not common form of chlorine due to low active strength (pH) - ANSWERS lithium hypochlorite (10.8) tablet/stick chlorine usually used in erosion feeder (pH - what will it do?) - ANSWERS trichlor (2.8 - 3.5, lower alkalinity and pH over time) salt used as a disinfectant (pH) - ANSWERS dichlor (6.7 - common in vinyl lined pools) most common type of chlorine used (pH) - ANSWERS sodium hypochlorite (NaOCl - 13) ______ needs special training to use and has a pH of ____ and will _____ when added to water - ANSWERS gas chlorine, 0, lower pH chlorine is most effective as a pH of _____ - ANSWERS 7.5 active disinfectant in the water - ANSWERS free chlorine (FC) FC is determined by the ______ test and is maintained between ____ and ____ ppm - ANSWERS DPD, 2, 4 equal to the amount of hypochlorous acid (HOCl) and the amt of hypochlorite ions (OCl-) - ANSWERS free chlorine (fc) the result of free chlorine reacting with organic compounds - ANSWERS combine chlorine (CC) common name and max for pools and spas for combine chlorine - ANSWERS chloramines, 0.2, 0.5 CC = - ANSWERS TC - FC what will a DPD measure - ANSWERS TC, FC how much CC should a pool have ideally - ANSWERS zero shocking the pool is also called - ANSWERS breakpoint chlorination breakpoint chlorination is the conversion of ________ into ______ - ANSWERS combine chlorine, nitrogen gas breakpoint chlorination equation - ANSWERS BPC = 10 x CC [BPC = 10 x (TC - FC)] whole cyanuric acid range: _____ to ______ppm - ANSWERS 0, 100 ideal cyanuric acid range: _____ to ______ ppm - ANSWERS 30, 50 acts as a protection for chlorine compounds from UV light - ANSWERS cyanuric acid CyA will act as a stabilizer for _______ but does not stabilize ________ - ANSWERS free chlorine, bromine The only way to reduce CyA concentration is to _______ - ANSWERS dilute the water and replace it whole range of bromine: ____ to _____ - ANSWERS 2, 10 ideal range of bromine: _____ to ______ - ANSWERS 4, 6 second most common disinfectant in the pool - ANSWERS bromine two types of bromine used - ANSWERS sodium bromide, solid bromide