Pool Operator Exam 127 complete
solutions.
Pool Operator Exam 127 complete
solutions.
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)
, Pool Operator Exam 127 complete
solutions.
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
equal to the amount of hypochlorous acid (HOCl) and the amt of hypochlorite ions (OCl-) - ANSWER free
chlorine (fc)
the result of free chlorine reacting with organic compounds - ANSWER combine chlorine (CC)
common name and max for pools and spas for combine chlorine - ANSWER chloramines, 0.2, 0.5
CC = - ANSWER TC - FC
what will a DPD measure - ANSWER TC, FC
how much CC should a pool have ideally - ANSWER zero
shocking the pool is also called - ANSWER breakpoint chlorination
solutions.
Pool Operator Exam 127 complete
solutions.
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)
, Pool Operator Exam 127 complete
solutions.
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
equal to the amount of hypochlorous acid (HOCl) and the amt of hypochlorite ions (OCl-) - ANSWER free
chlorine (fc)
the result of free chlorine reacting with organic compounds - ANSWER combine chlorine (CC)
common name and max for pools and spas for combine chlorine - ANSWER chloramines, 0.2, 0.5
CC = - ANSWER TC - FC
what will a DPD measure - ANSWER TC, FC
how much CC should a pool have ideally - ANSWER zero
shocking the pool is also called - ANSWER breakpoint chlorination
