Certified Pool Operator (CPO) Practice QUESTIONS & ANSWERS 2026 | A+ GRADED 100% VERIFIED

Certified Pool Operator (CPO) Practice
QUESTIONS & ANSWERS 2026 | A+
GRADED 100% VERIFIED
• Acid . Answer: lowers pH

• Total Alkalinity . Answer: ability of the water to maintain ideal pH

• Backwash . Answer: cleaning a filter by reversing the flow of water

• Sodium Bicarbonate (NaHCO) . Answer: baking soda, white powder,
raise alkalinity, small change in pH

• Breakpoint Chlorination . Answer: eliminate inorganic material, add
enough chlorine free chlorine to destroy chloramines

• Calcium Hardness . Answer: calcium part of the total hardness reading

• Chloramines . Answer: Combined Chlorine, forms when chlorine
bonds to ammonia, irritant to eyes and skin, strong smell

• DE Filter Media . Answer: white powder, fossilized skeletons, used in
DE Filters

• Effluent . Answer: outflow of water from pump, filter, pool

• Electrode/Probe . Answer: measures water properties

• Erosion Feeder . Answer: chemical feed device, water passes through
and erodes the dry chemical

• Free Chlorine . Answer: available chlorine, reacts to DPR powder for
testing