POOL OPERATORS test 3 Questions
and Answers Latest Versions 2025
Graded A+
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)
and Answers Latest Versions 2025
Graded A+
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)
