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REHS exam – Pools Questions With
Complete Solutions
% recirc from gutters/skimmers correct answer: 60% Indirect or direct connection to water supply correct answer: indirect how does deck and pool water drain to sewer correct answer: air gap public pool chlorination correct answer: automatic chlorinator Bacterial disease correct answer: Staphylococcal streptococcal trachoma salmonella leptospira pseudomonas legionella shigella mycobacterium campylobacter E. coli viral disease correct answer: Enterovirus Norwalk HepA
protozoan disease correct answer: Giardia cryptosporidium naegleria fowleri entamoeba helminths correct answer: schistosoma ascaris fungal disease correct answer: ringworm - trichophyton tinea Public beaches correct answer: changes require sanitary survey pH: 6.5-8. sample: every 300ft in 2 ft density: 50-200 sq. ft/person closing a beach correct answer: economic, social, psychological impacts swimming pool standards correct answer: pH: 7.2-7. free Cl: 1.0-4.0 ppm Alkalinity: 80-120 mg/L Hot tub correct answer: free Cl: 3.0-5.0 mg/L pH: 7.5-7.6 mg/L Turnover rates correct answer: public pool: 6-8 hrs private pool: 12 hrs wading pool: 1-2 hrs public spa: 30 min turnover= [pool capacity in gal] / [flow meter reading(gpm)][60]
algaecides: insurance policy Superchlorination correct answer: -Kills: algae, pseudomonas, entamoeba, schistisoma, giardia, crypto -private: shock 1x week, 2x week when hot -total cl-free cl= combined cl cc >0.2 mg/L need shock -bring water to 10x cc value -nonstablized cl -Br: using potassium monopersulfate -clean & backwash PRIOR Ozone and UV sanitation correct answer: O3: 3000x times faster than Cl UV: short life, no residual Alkalinity correct answer: -measure of acid reducing capacity available in water -80-120 mg/L -increase: sodium bicarbonate TDS correct answer: >1500ppm: cloud water, dec. Cl efficiency solution: dilution Temperature correct answer: Pools: 78-82, NOT over 85 Spas: 100-102, NOT over 102 (15 min max) Storing chemicals correct answer: 55-70 (60 is best) NOT over 95 Formed stool correct answer: 1. evacuate bathers
- remove fecal material
- Cl to 2 ppm, 7.2-7.5 pH, 30 min contact time
- fecal accident log Diarrhea accident correct answer: Cl: 20 ppm 12.75 hrs contact time cyanuric acid < 50 ppm Blood accident correct answer: No public health reason to close if 1.0+ Cl ppm Pool fencing correct answer: Min 4' high Self closing door Door latch > 40" off ground
