CPO EXAM GUIDE QUESTIONS AND ANSWERS WITH SOLUTIONS 2025

reducing hazards - ANSWER prevention is the best option water contamination - 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 - ANSWER Center for Disease Control Prevention solid fecal incident - ANSWER remove people, pH between 7.2-7.5, raise chlorine 2.0 ppm, 30 minute break diarrhea - 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 - ANSWER wear gloves, remove excess, disinfect all surfaces, follow guidelines of disposal & wash hands prevention practices - 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 - ANSWER aka sanitation=destroying microorganisms; consider chemical safety & storage space when considering a disinfectant oxidation - 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 - ANSWER chlorine chlorine compounds - 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 - ANSWER 30-50 ppm; decreases breakdown of chlorine because UV radiation (10x as strong)