Certified Pool Operator (CPO) Exam
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
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
