Pool Operator Exam Questions And Answers
Whole range chlorine in a pool: ____ to _____ - ANS ✔ - 1, 5
Ideal range chlorine in a pool: ____ to _____ - ANS ✔ - 2, 4
Whole range chlorine in a spa: ____ to _____ - ANS ✔ - 2, 10
Ideal range chlorine in a spa: ____ to _____ - ANS ✔ - 3, 5
4 types of solid chlorine - ANS ✔ - calcium hypochlorite, lithium hypochlorite, tricolor, dichlor
Liquid chlorine - ANS ✔ - sodium hypochlorite (NaOCl)
How active is gas chlorine - ANS ✔ - 100%
The active killing form of chlorine in water - ANS ✔ - hypochlorous acid (HOCl)
HOCl = ______ - ANS ✔ - H+ (hydrogen ion) + OCl- (hypochlorite ion)
Most common granular chlorine (pH range) - ANS ✔ - calcium hypochlorite (8.5 - 11, used to super
chlorinate water)
Not common form of chlorine due to low active strength (pH) - ANS ✔ - lithium hypochlorite (10.8)
Tablet/stick chlorine usually used in erosion feeder (pH - what will it do?) - ANS ✔ - trichlor (2.8 -
3.5, lower alkalinity and pH over time)
Salt used as a disinfectant (pH) - ANS ✔ - dichlor (6.7 - common in vinyl lined pools)
, Most common type of chlorine used (pH) - ANS ✔ - sodium hypochlorite (NaOCl - 13)
______ needs special training to use and has a pH of ____ and will _____ when added to water - ANS ✔ -
gas chlorine, 0, lower pH
Chlorine is most effective as a pH of _____ - ANS ✔ - 7.5
Active disinfectant in the water - ANS ✔ - free chlorine (FC)
FC is determined by the ______ test and is maintained between ____ and ____ ppm - ANS ✔ - DPD, 2, 4
Equal to the amount of hypochlorous acid (HOCl) and the amt of hypochlorite ions (OCl-) - ANS ✔ -
free chlorine (fc)
The result of free chlorine reacting with organic compounds - ANS ✔ - combine chlorine (CC)
Common name and max for pools and spas for combine chlorine - ANS ✔ - chloramines, 0.2, and 0.5
CC = - ANS ✔ - TC - FC
What will a DPD measure - ANS ✔ - TC, FC
How much CC should a pool have ideally - ANS ✔ - zero
Shocking the pool is also called - ANS ✔ - breakpoint chlorination
Breakpoint chlorination is the conversion of ________ into ______ - ANS ✔ - combine chlorine, nitrogen
gas
Whole range chlorine in a pool: ____ to _____ - ANS ✔ - 1, 5
Ideal range chlorine in a pool: ____ to _____ - ANS ✔ - 2, 4
Whole range chlorine in a spa: ____ to _____ - ANS ✔ - 2, 10
Ideal range chlorine in a spa: ____ to _____ - ANS ✔ - 3, 5
4 types of solid chlorine - ANS ✔ - calcium hypochlorite, lithium hypochlorite, tricolor, dichlor
Liquid chlorine - ANS ✔ - sodium hypochlorite (NaOCl)
How active is gas chlorine - ANS ✔ - 100%
The active killing form of chlorine in water - ANS ✔ - hypochlorous acid (HOCl)
HOCl = ______ - ANS ✔ - H+ (hydrogen ion) + OCl- (hypochlorite ion)
Most common granular chlorine (pH range) - ANS ✔ - calcium hypochlorite (8.5 - 11, used to super
chlorinate water)
Not common form of chlorine due to low active strength (pH) - ANS ✔ - lithium hypochlorite (10.8)
Tablet/stick chlorine usually used in erosion feeder (pH - what will it do?) - ANS ✔ - trichlor (2.8 -
3.5, lower alkalinity and pH over time)
Salt used as a disinfectant (pH) - ANS ✔ - dichlor (6.7 - common in vinyl lined pools)
, Most common type of chlorine used (pH) - ANS ✔ - sodium hypochlorite (NaOCl - 13)
______ needs special training to use and has a pH of ____ and will _____ when added to water - ANS ✔ -
gas chlorine, 0, lower pH
Chlorine is most effective as a pH of _____ - ANS ✔ - 7.5
Active disinfectant in the water - ANS ✔ - free chlorine (FC)
FC is determined by the ______ test and is maintained between ____ and ____ ppm - ANS ✔ - DPD, 2, 4
Equal to the amount of hypochlorous acid (HOCl) and the amt of hypochlorite ions (OCl-) - ANS ✔ -
free chlorine (fc)
The result of free chlorine reacting with organic compounds - ANS ✔ - combine chlorine (CC)
Common name and max for pools and spas for combine chlorine - ANS ✔ - chloramines, 0.2, and 0.5
CC = - ANS ✔ - TC - FC
What will a DPD measure - ANS ✔ - TC, FC
How much CC should a pool have ideally - ANS ✔ - zero
Shocking the pool is also called - ANS ✔ - breakpoint chlorination
Breakpoint chlorination is the conversion of ________ into ______ - ANS ✔ - combine chlorine, nitrogen
gas
