CPO Certified Pool Operator Exam Questions with Verified Correct Answers latest revised update 2025

CPO Certified Pool Operator Exam Questions
with Verified Correct Answers latest revised
update 2025


ideal cyanuric acid range: _____ to ______ ppm --- correct answer ---30, 50




acts as a protection for chlorine compounds from UV light --- correct
answer ---cyanuric acid




CyA will act as a stabilizer for _______ but does not

stabilize ________ --- correct answer ---free chlorine, bromine




The only way to reduce CyA concentration is to _______ --- correct answer -
--dilute the water and replace it




whole range of bromine: ____ to _____ --- correct answer ---2, 10




ideal range of bromine: _____ to ______ --- correct answer ---4, 6




second most common disinfectant in the pool --- correct answer ---bromine

, two types of bromine used --- correct answer ---sodium bromide, solid
bromide




Bromine in natural form is a ______ but is in _____ form when

added to pools --- correct answer ---reddish brown liquid, solid




__________ is similar to hypochlorous acid --- correct answer ---
hypobromous acid




bromine releases _____ and _____ when added to water --- correct answer -
--hypobromite ion, hydrogen ion




bromine will ______ pH when added to water --- correct answer ---lower




whole range of pH: ____to_____ --- correct answer ---7.2, 7.8




ideal range of pH: ____ to ____ --- correct answer ---7.4, 7.6




things that influence pH (6) --- correct answer ---swimmer waste,
disinfectants, water source, air borne debris, chemical balance, evaporation




low pH leads to (3) --- correct answer ---corrosive water, surface staining,
surface etching