POOL OPERATOR EXAM 2 COMPREHENSIVE EXAM SCRIPT 2026 SOLVED QUESTIONS FULL SOLUTION

POOL OPERATOR EXAM 2 COMPREHENSIVE
EXAM SCRIPT 2026 SOLVED QUESTIONS FULL
SOLUTION

◉ ideal range chlorine in a pool: ____ to _____. Answer: 2, 4


◉ whole range chlorine in a spa: ____ to _____. Answer: 2, 10


◉ ideal range chlorine in a spa: ____ to _____. Answer: 3, 5


◉ 4 types of solid chlorine. Answer: calcium hypochlorite, lithium
hypochlorite, trichlor, dichlor


◉ liquid chlorine. Answer: sodium hypochlorite (NaOCl)


◉ how active is gas chlorine. Answer: 100%


◉ the active killing form of chlorine in water. Answer: hypochlorous
acid (HOCl)


◉ HOCl = ______. Answer: H+ (hydrogen ion) + OCl- (hypochlorite
ion)

, ◉ most common granular chlorine (pH range). Answer: calcium
hypochlorite (8.5 - 11, used to super chlorinate water)


◉ not common form of chlorine due to low active strength (pH).
Answer: lithium hypochlorite (10.8)


◉ tablet/stick chlorine usually used in erosion feeder (pH - what
will it do?). Answer: trichlor (2.8 - 3.5, lower alkalinity and pH over
time)


◉ salt used as a disinfectant (pH). Answer: dichlor (6.7 - common in
vinyl lined pools)


◉ most common type of chlorine used (pH). Answer: sodium
hypochlorite (NaOCl - 13)


◉ ______ needs special training to use and has a pH of ____ and will
_____ when added to water. Answer: gas chlorine, 0, lower pH


◉ chlorine is most effective as a pH of _____. Answer: 7.5


◉ active disinfectant in the water. Answer: free chlorine (FC)