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CPO Exam Guide QUESTIONS & ANSWERS 2024 ( A+ GRADED 100% VERIFIED).
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CPO Exam Guide QUESTIONS & ANSWERS 2024 ( A+GRADED 100% VERIFIED)
reducing hazards - Correct Answer - prevention is the best option
water contamination - Correct Answer - 1. fecal related (crypto, giardia, shigella, e coli, adenovirus,
hepatitis A)
2. non-fecal (pseudomonas aeruginosa, swimmer's ear, legionella pneumophila, molluspioxvirus,
planter's warts, athlete's foot)
CDC - Correct Answer - Center for Disease Control Prevention
solid fecal incident - Correct Answer - remove people, pH between 7.2-7.5, raise chlorine 2.0 ppm, 30
minute break
diarrhea - Correct Answer - remove people, pH 7.2-7.5, raise chlorine to 20.0 ppm (12.75 hrs), after
backwash filters, raise chlorine to normal, then re-open pool
handling contaminated material - Correct Answer - wear gloves, remove excess, disinfect all surfaces,
follow guidelines of disposal & wash hands
prevention practices - Correct Answer - 1. maintain proper disinfectant levels at all times
2. have kids use bathroom before
3. swimmer's shower before swimming
4. prohibit swimming with wounds/sores
5. work with local health department
disinfection - Correct Answer - aka sanitation=destroying microorganisms; consider chemical safety &
storage space when considering a disinfectant
oxidation - Correct Answer - process of changing a chemical structure of contaminants to remove from
water (turn into simple gases); affected by: pH, temperature, environmental wastes & bather
contamination
, what is the most common disinfectant used - Correct Answer - chlorine
chlorine compounds - Correct Answer - 1. organic (trichlor and dichlor); contain cyanuric acid; stabilized
2. inorganic (calcium hypochlorite, sodium hypochlorite, lithium hypochlorite, chlorine gas); no cyanuric
acid; unstabalized, but can be stabilized with acid; sensitive to light
cyanuric acid - Correct Answer - 30-50 ppm; decreases breakdown of chlorine because UV radiation
(10x as strong)
chemistry of chlorine - Correct Answer - when a chlorine compound is introduced to water this leads to
a chemical reaction which creates either hypochlorous acid (kills microorganisms) or hypochlorite ion
(inactive form of chlorine)
types of chlorine - Correct Answer - free (available for disinfection), combined, or total
DPD tests - Correct Answer - measure of free chlorine; kits or strip tests; see different shades of reds
acceptable range of free chlorine - Correct Answer - 1.0-5.0ppm
combined chlorine (chloramines) - Correct Answer - free chlorine plus ammonia or nitrogen containing
organic compounds (chemical bond); no longer an effective disinfectant (may cause odor, etc.); ideal
amount should be 0 (allowed amount= 0.2 ppm in pools or 0.5 ppm in spas)
bromine - Correct Answer - disinfectant in pools/spas-good algicidal properties--not as good oxidizer--
tablets or sodium bromine
ozone - Correct Answer - disinfectant in pools/spas; must be used with chlorine or bromine; can't be
transported; leaves no residue in water; produced by ultra violet light or corona discharge
water balance - Correct Answer - correct ratio of mineral content and pH to prevent pool water from
being corrosive/scaly; protects pool from chemical erosion
factors that contribute to water balance - Correct Answer - pH, alkalinity, calcium hardness,
temperature, total dissolved solids
pH - Correct Answer - proteins hydrogen; most impact on balanced water; measured by acid vs. base: 0-
14 (0=acidic, 14=base, 7=neutral); 6 has 10x the pH of 7, 7 has 10x the pH of 8, etc.
pool pH - Correct Answer - should be slightly above neutral; most compatible range=7.2 and 7.8;
ideal=7.4 and 7.6; lower the pH, the more effective
total alkalinity - Correct Answer - measure of ability of water to resist changes in pH (w/o can have
dramatic high and lows); prevent pH bounce; acceptable range=60 to 180 ppm/ ideal range=80 to
120ppm
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