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