Pool Operator Exam With complete
solution Latest 2024/25 RATED A+
whole range chlorine in a pool: ____ to _____ - 1, 5
ii ii ii ii ii ii ii ii ii ii ii ii ii
ii iiideal range chlorine in a pool: ____ to _____ - 2, 4
ii ii ii ii ii ii ii ii ii ii ii ii ii
ii iiwhole range chlorine in a spa: ____ to _____ - 2, 10
ii ii ii ii ii ii ii ii ii ii ii ii ii
ii iiideal range chlorine in a spa: ____ to _____ - 3, 5
ii ii ii ii ii ii ii ii ii ii ii ii ii
ii ii4 types of solid chlorine - calcium hypochlorite, lithium hypochlorite, trichlor, dichlor
ii ii ii ii ii ii ii ii ii ii ii ii ii
ii iiliquid chlorine - sodium hypochlorite (NaOCl)
ii ii ii ii ii ii ii
ii iihow active is gas chlorine - 100%
ii ii ii ii ii ii ii ii
ii iithe active killing form of chlorine in water - hypochlorous acid (HOCl)
ii ii ii ii ii ii ii ii ii ii ii ii ii
ii iiHOCl = ______ - H+ (hydrogen ion) + OCl- (hypochlorite ion)
ii ii ii ii ii ii ii ii ii ii ii ii
most common granular chlorine (pH range) - calcium hypochlorite (8.5 - 11, used to super
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
chlorinate water)
ii ii
ii iinot common form of chlorine due to low active strength (pH) - lithium hypochlorite (10.8)
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
tablet/stick chlorine usually used in erosion feeder (pH - what will it do?) - trichlor (2.8 -
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
3.5, lower alkalinity and pH over time)
ii ii ii ii ii ii ii
ii iisalt used as a disinfectant (pH) - dichlor (6.7 - common in vinyl lined pools)
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
ii iimost common type of chlorine used (pH) - sodium hypochlorite (NaOCl - 13)
ii ii ii ii ii ii ii ii ii ii ii ii ii ii
______ needs special training to use and has a pH of ____ and will _____ when added to
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
water - gas chlorine, 0, lower pH
ii ii ii ii ii ii ii ii ii
ii iichlorine is most effective as a pH of _____ - 7.5 ii ii ii ii ii ii ii ii ii ii ii ii
ii iiactive disinfectant in the water - free chlorine (FC)
ii ii ii ii ii ii ii ii ii ii
FC is determined by the ______ test and is maintained between ____ and ____ ppm -
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
DPD, 2, 4
ii ii ii
, ii iiequal to the amount of hypochlorous acid (HOCl) and the amt of hypochlorite ions (OCl-) -
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
ii iifree chlorine (fc)
ii ii
ii ii the result of free chlorine reacting with organic compounds - combine chlorine (CC)
ii ii ii ii ii ii ii ii ii ii ii ii ii ii
ii ii common name and max for pools and spas for combine chlorine - chloramines, 0.2, 0.5
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
ii ii CC = - TC - FC
ii ii ii ii ii ii ii
ii ii what will a DPD measure - TC, FC
ii ii ii ii ii ii ii ii ii
ii ii how much CC should a pool have ideally - zero
ii ii ii ii ii ii ii ii ii ii ii
ii ii shocking the pool is also called - breakpoint chlorination ii ii ii ii ii ii ii ii ii ii
breakpoint chlorination is the conversion of ________ into ______ - combine chlorine,
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
nitrogen gas
ii ii
ii ii breakpoint chlorination equation - BPC = 10 x CC [BPC = 10 x (TC - FC)] ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
ii ii whole cyanuric acid range: _____ to ______ppm - 0, 100
ii ii ii ii ii ii ii ii ii ii ii
ii ii ideal cyanuric acid range: _____ to ______ ppm - 30, 50
ii ii ii ii ii ii ii ii ii ii ii ii
ii ii acts as a protection for chlorine compounds from UV light - cyanuric acid
ii ii ii ii ii ii ii ii ii ii ii ii ii ii
CyA will act as a stabilizer for _______ but does not
ii ii ii ii ii ii ii ii ii ii ii ii
stabilize ________ - free chlorine, bromine ii ii ii ii ii ii ii
ii ii The only way to reduce CyA concentration is to _______ - dilute the water and replace it
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
ii ii whole range of bromine: ____ to _____ - 2, 10
ii ii ii ii ii ii ii ii ii ii ii
ii ii ideal range of bromine: _____ to ______ - 4, 6
ii ii ii ii ii ii ii ii ii ii ii
ii ii second most common disinfectant in the pool - bromine
ii ii ii ii ii ii ii ii ii ii
ii ii two types of bromine used - sodium bromide, solid bromide
ii ii ii ii ii ii ii ii ii ii ii
Bromine in natural form is a ______ but is in _____ form when
ii ii ii ii ii ii ii ii ii ii ii ii ii ii
added to pools - reddish brown liquid, solid
ii ii ii ii ii ii ii ii ii
ii ii __________ is similar to hypochlorous acid - hypobromous acid ii ii ii ii ii ii ii ii ii ii
bromine releases _____ and _____ when added to water - hypobromite ion, hydrogen
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
ion
ii
solution Latest 2024/25 RATED A+
whole range chlorine in a pool: ____ to _____ - 1, 5
ii ii ii ii ii ii ii ii ii ii ii ii ii
ii iiideal range chlorine in a pool: ____ to _____ - 2, 4
ii ii ii ii ii ii ii ii ii ii ii ii ii
ii iiwhole range chlorine in a spa: ____ to _____ - 2, 10
ii ii ii ii ii ii ii ii ii ii ii ii ii
ii iiideal range chlorine in a spa: ____ to _____ - 3, 5
ii ii ii ii ii ii ii ii ii ii ii ii ii
ii ii4 types of solid chlorine - calcium hypochlorite, lithium hypochlorite, trichlor, dichlor
ii ii ii ii ii ii ii ii ii ii ii ii ii
ii iiliquid chlorine - sodium hypochlorite (NaOCl)
ii ii ii ii ii ii ii
ii iihow active is gas chlorine - 100%
ii ii ii ii ii ii ii ii
ii iithe active killing form of chlorine in water - hypochlorous acid (HOCl)
ii ii ii ii ii ii ii ii ii ii ii ii ii
ii iiHOCl = ______ - H+ (hydrogen ion) + OCl- (hypochlorite ion)
ii ii ii ii ii ii ii ii ii ii ii ii
most common granular chlorine (pH range) - calcium hypochlorite (8.5 - 11, used to super
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
chlorinate water)
ii ii
ii iinot common form of chlorine due to low active strength (pH) - lithium hypochlorite (10.8)
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
tablet/stick chlorine usually used in erosion feeder (pH - what will it do?) - trichlor (2.8 -
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
3.5, lower alkalinity and pH over time)
ii ii ii ii ii ii ii
ii iisalt used as a disinfectant (pH) - dichlor (6.7 - common in vinyl lined pools)
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
ii iimost common type of chlorine used (pH) - sodium hypochlorite (NaOCl - 13)
ii ii ii ii ii ii ii ii ii ii ii ii ii ii
______ needs special training to use and has a pH of ____ and will _____ when added to
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
water - gas chlorine, 0, lower pH
ii ii ii ii ii ii ii ii ii
ii iichlorine is most effective as a pH of _____ - 7.5 ii ii ii ii ii ii ii ii ii ii ii ii
ii iiactive disinfectant in the water - free chlorine (FC)
ii ii ii ii ii ii ii ii ii ii
FC is determined by the ______ test and is maintained between ____ and ____ ppm -
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
DPD, 2, 4
ii ii ii
, ii iiequal to the amount of hypochlorous acid (HOCl) and the amt of hypochlorite ions (OCl-) -
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
ii iifree chlorine (fc)
ii ii
ii ii the result of free chlorine reacting with organic compounds - combine chlorine (CC)
ii ii ii ii ii ii ii ii ii ii ii ii ii ii
ii ii common name and max for pools and spas for combine chlorine - chloramines, 0.2, 0.5
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
ii ii CC = - TC - FC
ii ii ii ii ii ii ii
ii ii what will a DPD measure - TC, FC
ii ii ii ii ii ii ii ii ii
ii ii how much CC should a pool have ideally - zero
ii ii ii ii ii ii ii ii ii ii ii
ii ii shocking the pool is also called - breakpoint chlorination ii ii ii ii ii ii ii ii ii ii
breakpoint chlorination is the conversion of ________ into ______ - combine chlorine,
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
nitrogen gas
ii ii
ii ii breakpoint chlorination equation - BPC = 10 x CC [BPC = 10 x (TC - FC)] ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
ii ii whole cyanuric acid range: _____ to ______ppm - 0, 100
ii ii ii ii ii ii ii ii ii ii ii
ii ii ideal cyanuric acid range: _____ to ______ ppm - 30, 50
ii ii ii ii ii ii ii ii ii ii ii ii
ii ii acts as a protection for chlorine compounds from UV light - cyanuric acid
ii ii ii ii ii ii ii ii ii ii ii ii ii ii
CyA will act as a stabilizer for _______ but does not
ii ii ii ii ii ii ii ii ii ii ii ii
stabilize ________ - free chlorine, bromine ii ii ii ii ii ii ii
ii ii The only way to reduce CyA concentration is to _______ - dilute the water and replace it
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
ii ii whole range of bromine: ____ to _____ - 2, 10
ii ii ii ii ii ii ii ii ii ii ii
ii ii ideal range of bromine: _____ to ______ - 4, 6
ii ii ii ii ii ii ii ii ii ii ii
ii ii second most common disinfectant in the pool - bromine
ii ii ii ii ii ii ii ii ii ii
ii ii two types of bromine used - sodium bromide, solid bromide
ii ii ii ii ii ii ii ii ii ii ii
Bromine in natural form is a ______ but is in _____ form when
ii ii ii ii ii ii ii ii ii ii ii ii ii ii
added to pools - reddish brown liquid, solid
ii ii ii ii ii ii ii ii ii
ii ii __________ is similar to hypochlorous acid - hypobromous acid ii ii ii ii ii ii ii ii ii ii
bromine releases _____ and _____ when added to water - hypobromite ion, hydrogen
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
ion
ii
