POOL OPERATOR'S (NV POOLS) EXAM
QUESTIONS WITH COMPLETE
ANSWERS
Surface Area (rectangle,circle) - Answer-length x width
Pool Volume (rectangle,circle) - Answer-length x width x average depth x 7.5
Chlorine comes in 3 forms - Answer-solid, liquid and gas
When chlorine is combined with water also referred as free chlorine which is the active
killing disinfectant form of chlorine it forms - Answer-Hypochlorous Acid
most common disinfectant used to treat a pool, effective in sanitizing water by killing or
inactivating pathogens and algae, used to oxidize or destroy other materials from the
environment - Answer-Chlorine
Chemicals used to neutralize chlorine - Answer-sodium sulfite
Acceptable range of free chlorine in a swimming pool - Answer-1.0 to 3.0 ppm
Acceptable range of chlorine in a spa - Answer-3.0 to 5.0
evaporate and are the cause of chlorine smell, are irritating to the skin and mucous
membrane, caused by chlorine combining it self to organic maters such as ammonia -
Answer-Chloramines
Combine chlorine formula - Answer-Combine Chlorine equals Total Chlorine plus Free
Chlorine
has a pH of about 9, when added to water it raises the pH of the water - Answer-Liquid
chlorine
calcium hypochlorite, lithium hypochlorite, trichlor and dichlor - Answer-Forms of dry
chlorine
deteriorates quickly into exposed air; it's affected by sunlight and high temps Chemical
name for liquid chlorine - Answer-sodium hypochlorite
Cyanuric Acid (CA) is used to - Answer-stabilize chlorine
Cyanuric Acid (CA) should be maintained between - Answer-30 to 50 ppm
, When using Cyanuric Acid (CA) to stabilize a pool the chlorine level must stay above -
Answer-2 ppm
The acceptable range of Bromine in a pool or a spa - Answer-3 ppm
disinfectant some times used instead of chlorine, can be used as an effective sanitizer -
Answer-Bromine
The recommended range for pH is - Answer-7.2-7.8
To raise pH you should add - Answer-sodium carbonate
To lower the pH you should add - Answer-Muriatic acid
Low pH will cause - Answer-Corrosive water and staining of surface walls
High pH will cause - Answer-Cloudy water, chlorine inefficiency and eye/skin irritation
The recommended range for Total Alkalinity(TA) is - Answer-80 to 120ppm
Low Total Alkalinity(TA) will cause - Answer-pH bounce and etching of the pool surface
High Total Alkalinity(TA) will cause - Answer-pH lock and cloudy water
To raise Total Alkalinity(TA) you should add - Answer-Sodium Bicarbonate
To lower Total Alkalinity(TA) you should add - Answer-Muriatic Acid or Sodium Bisulfate
The recommended range for Calcium Hardness(CH) is - Answer-200 to 400ppm
Low Calcium Hardness(CH) can cause - Answer-Corrosive water
High Calcium Hardness(CH) can cause - Answer-scaling water and clogged filters
To raise Calcium Hardness(CH) you should add - Answer-Calcium Chloride
To lower Calcium Hardness(CH) you should - Answer-Dilute the water
Max temp of spa is - Answer-104 F
An effective technique to reduce inorganic chloramines which cause chlorine odor is -
Answer-Breakpoint Chlorination
The most common minerals that cause stains are - Answer-Iron, copper and
manganese
QUESTIONS WITH COMPLETE
ANSWERS
Surface Area (rectangle,circle) - Answer-length x width
Pool Volume (rectangle,circle) - Answer-length x width x average depth x 7.5
Chlorine comes in 3 forms - Answer-solid, liquid and gas
When chlorine is combined with water also referred as free chlorine which is the active
killing disinfectant form of chlorine it forms - Answer-Hypochlorous Acid
most common disinfectant used to treat a pool, effective in sanitizing water by killing or
inactivating pathogens and algae, used to oxidize or destroy other materials from the
environment - Answer-Chlorine
Chemicals used to neutralize chlorine - Answer-sodium sulfite
Acceptable range of free chlorine in a swimming pool - Answer-1.0 to 3.0 ppm
Acceptable range of chlorine in a spa - Answer-3.0 to 5.0
evaporate and are the cause of chlorine smell, are irritating to the skin and mucous
membrane, caused by chlorine combining it self to organic maters such as ammonia -
Answer-Chloramines
Combine chlorine formula - Answer-Combine Chlorine equals Total Chlorine plus Free
Chlorine
has a pH of about 9, when added to water it raises the pH of the water - Answer-Liquid
chlorine
calcium hypochlorite, lithium hypochlorite, trichlor and dichlor - Answer-Forms of dry
chlorine
deteriorates quickly into exposed air; it's affected by sunlight and high temps Chemical
name for liquid chlorine - Answer-sodium hypochlorite
Cyanuric Acid (CA) is used to - Answer-stabilize chlorine
Cyanuric Acid (CA) should be maintained between - Answer-30 to 50 ppm
, When using Cyanuric Acid (CA) to stabilize a pool the chlorine level must stay above -
Answer-2 ppm
The acceptable range of Bromine in a pool or a spa - Answer-3 ppm
disinfectant some times used instead of chlorine, can be used as an effective sanitizer -
Answer-Bromine
The recommended range for pH is - Answer-7.2-7.8
To raise pH you should add - Answer-sodium carbonate
To lower the pH you should add - Answer-Muriatic acid
Low pH will cause - Answer-Corrosive water and staining of surface walls
High pH will cause - Answer-Cloudy water, chlorine inefficiency and eye/skin irritation
The recommended range for Total Alkalinity(TA) is - Answer-80 to 120ppm
Low Total Alkalinity(TA) will cause - Answer-pH bounce and etching of the pool surface
High Total Alkalinity(TA) will cause - Answer-pH lock and cloudy water
To raise Total Alkalinity(TA) you should add - Answer-Sodium Bicarbonate
To lower Total Alkalinity(TA) you should add - Answer-Muriatic Acid or Sodium Bisulfate
The recommended range for Calcium Hardness(CH) is - Answer-200 to 400ppm
Low Calcium Hardness(CH) can cause - Answer-Corrosive water
High Calcium Hardness(CH) can cause - Answer-scaling water and clogged filters
To raise Calcium Hardness(CH) you should add - Answer-Calcium Chloride
To lower Calcium Hardness(CH) you should - Answer-Dilute the water
Max temp of spa is - Answer-104 F
An effective technique to reduce inorganic chloramines which cause chlorine odor is -
Answer-Breakpoint Chlorination
The most common minerals that cause stains are - Answer-Iron, copper and
manganese
