Pool Operator Certification Exam 2025 | Complete Study Guide with Verified Questions & Answers

Pool Operator Certification Exam 2025 |
Complete Study Guide with Verified
Questions & Answers




Whole range chlorine in a pool: ____ to _____ -
Answer✅️ ☑️1, 5


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)


FC is determined by the ______ test and is
maintained between ____ and ____ ppm –
Answer✅️ ☑️DPD, 2, 4