Pool Ops Exam UPDATED Exam Questions
and CORRECT Answers
surface area formula - CORRECT ANSWER - Rectangle: (length)x(width)
circle: πr²
pool volume - CORRECT ANSWER - Rectangle = length x width x average depth x 7.5
Circle = r x r x 3.14 x 7.5
states of chlorine - CORRECT ANSWER - solid, liquid and gas
chlorine - CORRECT ANSWER - When combined with water it forms Hypochlorous Acid
also referred to as free ____. Free ____ is the active killing disinfectant form of ____. The most
common disinfectant used to treat a pool is ____. It is effective in sanitizing water by killing or
inactivation pathogens and algae. It is also used to oxidize or destroy other materials from the
environment.
chlorine neutralizers - CORRECT ANSWER - Sodium Thiosulfate or Sodium Sulfite
free chlorine - CORRECT ANSWER - "The acceptable range of ____ ____ in a swimming
pool is 1.0 to 3.0 ppm
The acceptable range of ____ in a spa is 3.0 - 5.0 (ideal is 4.0) "
chloramines - CORRECT ANSWER - they evaporate and are the cause of chlorine smell often
in an indoor pool. They are irritating to the skin and mucous membrane. They are caused by
chlorine combining it self to organic maters such as ammonia
combine chlorine formula - CORRECT ANSWER - = TC - FC (total chlorine - free chlorine)
, liquid chlorine - CORRECT ANSWER - has a pH of about 9, therefore when added to water it
will raise the pH of the water.
The chemical name for this is sodium hypochlorite. Sodium Hypochlorite deteriorates quickly
into exposed air . It is affected by sunlight and high temperatures
dry chlorine - CORRECT ANSWER - There are many forms including calcium hypochlorite,
lithium hypochlorite, trichlor and dichlor
cyanuric acid - CORRECT ANSWER - is used to stabilize chlorine. It should be maintained
between 30 and 50 ppm. When using to stabilize a pool the chlorine level must stay above 2.0
ppm
bromine - CORRECT ANSWER - "The acceptable range of this in a pool or a spa is 3.0ppm.
it is a disinfectant some times used instead of chlorine. It differs from chlorine in that it
combined can be used as an effective sanitizer "
pH - CORRECT ANSWER - The recommended range is 7.2-7.8
"To raise you should add sodium carbonate also referred to as soda ash
to lower you should add and acid such as muriatic acid "
"Low will cause corrosive water and staining of surface walls
High will cause cloudy water, chlorine inefficiency and eye/skin irritation "
total alkalinity - CORRECT ANSWER - The recommended range is 80 - 120 ppm
"Low will cause pH bounce and etching of the pool surface
High will cause pH Lock and cloudy water "
"To raise you should add Sodium Bicarbonate
To lower you should add Muriatic Acid or Sodium Bisulfate "
calcium hardness - CORRECT ANSWER - The recommended range is 200 to 400 ppm
"Low can cause corrosive water
and CORRECT Answers
surface area formula - CORRECT ANSWER - Rectangle: (length)x(width)
circle: πr²
pool volume - CORRECT ANSWER - Rectangle = length x width x average depth x 7.5
Circle = r x r x 3.14 x 7.5
states of chlorine - CORRECT ANSWER - solid, liquid and gas
chlorine - CORRECT ANSWER - When combined with water it forms Hypochlorous Acid
also referred to as free ____. Free ____ is the active killing disinfectant form of ____. The most
common disinfectant used to treat a pool is ____. It is effective in sanitizing water by killing or
inactivation pathogens and algae. It is also used to oxidize or destroy other materials from the
environment.
chlorine neutralizers - CORRECT ANSWER - Sodium Thiosulfate or Sodium Sulfite
free chlorine - CORRECT ANSWER - "The acceptable range of ____ ____ in a swimming
pool is 1.0 to 3.0 ppm
The acceptable range of ____ in a spa is 3.0 - 5.0 (ideal is 4.0) "
chloramines - CORRECT ANSWER - they evaporate and are the cause of chlorine smell often
in an indoor pool. They are irritating to the skin and mucous membrane. They are caused by
chlorine combining it self to organic maters such as ammonia
combine chlorine formula - CORRECT ANSWER - = TC - FC (total chlorine - free chlorine)
, liquid chlorine - CORRECT ANSWER - has a pH of about 9, therefore when added to water it
will raise the pH of the water.
The chemical name for this is sodium hypochlorite. Sodium Hypochlorite deteriorates quickly
into exposed air . It is affected by sunlight and high temperatures
dry chlorine - CORRECT ANSWER - There are many forms including calcium hypochlorite,
lithium hypochlorite, trichlor and dichlor
cyanuric acid - CORRECT ANSWER - is used to stabilize chlorine. It should be maintained
between 30 and 50 ppm. When using to stabilize a pool the chlorine level must stay above 2.0
ppm
bromine - CORRECT ANSWER - "The acceptable range of this in a pool or a spa is 3.0ppm.
it is a disinfectant some times used instead of chlorine. It differs from chlorine in that it
combined can be used as an effective sanitizer "
pH - CORRECT ANSWER - The recommended range is 7.2-7.8
"To raise you should add sodium carbonate also referred to as soda ash
to lower you should add and acid such as muriatic acid "
"Low will cause corrosive water and staining of surface walls
High will cause cloudy water, chlorine inefficiency and eye/skin irritation "
total alkalinity - CORRECT ANSWER - The recommended range is 80 - 120 ppm
"Low will cause pH bounce and etching of the pool surface
High will cause pH Lock and cloudy water "
"To raise you should add Sodium Bicarbonate
To lower you should add Muriatic Acid or Sodium Bisulfate "
calcium hardness - CORRECT ANSWER - The recommended range is 200 to 400 ppm
"Low can cause corrosive water
