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CPO CERTIFIED POOL AND SPA OPERATOR EXAM
2026 2027 VERIFIED 100 PERCENT VERIFIED
CORRECT ANSWERS HIGH YIELD STUDY GUIDE
ACTUAL UPDATED PRACTICE QUESTIONS
CERTIFICATION EXAM PREPARATION GRADED A+
SUCCESS REVIEW BRAND NEW VERSION
Breakpoint Chlorination - CORRECT ANSWER=eliminate inorganic material,
add enough chlorine free chlorine to destroy chloramines
Calcium Hardness - CORRECT ANSWER=calcium part of the total hardness
reading
Chloramines - CORRECT ANSWER=Combined Chlorine, forms when
chlorine bonds to ammonia, irritant to eyes and skin, strong smell
DE Filter Media - CORRECT ANSWER=white powder, fossilized skeletons,
used in DE Filters
Effluent - CORRECT ANSWER=outflow of water from pump, filter, pool
Electrode/Probe - CORRECT ANSWER=measures water properties
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Erosion Feeder - CORRECT ANSWER=chemical feed device, water passes
through and erodes the dry chemical
Free Chlorine - CORRECT ANSWER=available chlorine, reacts to DPR powder
for testing
Hydrochloric Acid (HCL) - CORRECT ANSWER=Also called Muriatic Acid,
strong acid used to reduce pH and Total Alkalinity
Influent - CORRECT ANSWER=in flow of water to a pump, filter, pool
Oxidation Reduction Potential (ORP) - CORRECT ANSWER=measures how
effective the chlorine is in the water, relates to the concentration of oxidizer
Parts Per Million (PPM) - CORRECT ANSWER=measured in 1 million units
pH - CORRECT ANSWER=logarithm of the hydrogen-ion in the water
Saturation Index - CORRECT ANSWER=calculation to predict if water has a
tendency to be corrosive
Sodium Hypochlorite (NaOCl) - CORRECT ANSWER=Liquid bleach, liquid
chlorine, disenfectant, 10-15% available chlorine for pools, 5% for household
use
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Sodium Carbonate (Na2CO3) - CORRECT ANSWER=white powder, raise pH
and alkalinity
Sodium Thiosulfate (Na2S2O3) - CORRECT ANSWER=used to remove
chlorine from water
Superchlorination - CORRECT ANSWER=adding large amount of chlorine to
water to destroy
Total Dissolved Solids (TDS) - CORRECT ANSWER=amount of residue if water
was removed
Total Hardness - CORRECT ANSWER=amount of calcium and magnesium in
the water
Turbidity - CORRECT ANSWER=cloudiness of the water
Turnover Rate - CORRECT ANSWER=time it takes for water volume to move
through filter
You operate a 120,000-gallon pool, and upon performing your hourly chemical
tests you observe the following readings: Total Available Chlorine reading is
1.6 free available chlorine reading is 1.5 pH is 7.4 Your supervising lifeguard
has just informed you that you have had a fecal incident occur; a solid stool
has been discharged into the pool. According to the Centers for Disease
CPO CERTIFIED POOL AND SPA OPERATOR EXAM
2026 2027 VERIFIED 100 PERCENT VERIFIED
CORRECT ANSWERS HIGH YIELD STUDY GUIDE
ACTUAL UPDATED PRACTICE QUESTIONS
CERTIFICATION EXAM PREPARATION GRADED A+
SUCCESS REVIEW BRAND NEW VERSION
Breakpoint Chlorination - CORRECT ANSWER=eliminate inorganic material,
add enough chlorine free chlorine to destroy chloramines
Calcium Hardness - CORRECT ANSWER=calcium part of the total hardness
reading
Chloramines - CORRECT ANSWER=Combined Chlorine, forms when
chlorine bonds to ammonia, irritant to eyes and skin, strong smell
DE Filter Media - CORRECT ANSWER=white powder, fossilized skeletons,
used in DE Filters
Effluent - CORRECT ANSWER=outflow of water from pump, filter, pool
Electrode/Probe - CORRECT ANSWER=measures water properties
,2 | Page
Erosion Feeder - CORRECT ANSWER=chemical feed device, water passes
through and erodes the dry chemical
Free Chlorine - CORRECT ANSWER=available chlorine, reacts to DPR powder
for testing
Hydrochloric Acid (HCL) - CORRECT ANSWER=Also called Muriatic Acid,
strong acid used to reduce pH and Total Alkalinity
Influent - CORRECT ANSWER=in flow of water to a pump, filter, pool
Oxidation Reduction Potential (ORP) - CORRECT ANSWER=measures how
effective the chlorine is in the water, relates to the concentration of oxidizer
Parts Per Million (PPM) - CORRECT ANSWER=measured in 1 million units
pH - CORRECT ANSWER=logarithm of the hydrogen-ion in the water
Saturation Index - CORRECT ANSWER=calculation to predict if water has a
tendency to be corrosive
Sodium Hypochlorite (NaOCl) - CORRECT ANSWER=Liquid bleach, liquid
chlorine, disenfectant, 10-15% available chlorine for pools, 5% for household
use
, 3 | Page
Sodium Carbonate (Na2CO3) - CORRECT ANSWER=white powder, raise pH
and alkalinity
Sodium Thiosulfate (Na2S2O3) - CORRECT ANSWER=used to remove
chlorine from water
Superchlorination - CORRECT ANSWER=adding large amount of chlorine to
water to destroy
Total Dissolved Solids (TDS) - CORRECT ANSWER=amount of residue if water
was removed
Total Hardness - CORRECT ANSWER=amount of calcium and magnesium in
the water
Turbidity - CORRECT ANSWER=cloudiness of the water
Turnover Rate - CORRECT ANSWER=time it takes for water volume to move
through filter
You operate a 120,000-gallon pool, and upon performing your hourly chemical
tests you observe the following readings: Total Available Chlorine reading is
1.6 free available chlorine reading is 1.5 pH is 7.4 Your supervising lifeguard
has just informed you that you have had a fecal incident occur; a solid stool
has been discharged into the pool. According to the Centers for Disease
