POOL OPERATOR STANDARD EXAMS ANSWERS
AND QUESTIONS SET A+
✔✔protozoa - ✔✔cryptosporidium
giardia
✔✔bacteria - ✔✔shigella
E. coli
✔✔viruses - ✔✔norovirus
adenovirus
hepatitis a
✔✔what is the response for formed stool? - ✔✔1. raise the free available chlorine level
to 2 ppm and ensure the pH is 7.5 or less at 77 deg. or higher
2. maintain the chlorine concentration for at least 25 min before opening the pool
3. ensure the filtration system is operating while the pool reaches and maintains the
proper free chlorine concentration
✔✔what is the response for diarrheal discharge? - ✔✔1. raise the free available
chlorine level to 20 ppm
2. maintain the pH of 7.5 or less at 77 deg. or higher
3. maintain the pH and chlorine level for 12.75 hours
4. backwash the filter after full disinfection time
5. return the chlorine level to normal levels
✔✔Contamination Time (CT) value - ✔✔-the concentration of free chlorine in ppm times
time in min
✔✔what is the CT value for giardia? - ✔✔45
✔✔what is the CT value for crypto - ✔✔15,300
, ✔✔hypochlorous acid (HCl) - ✔✔-inactivates pathogens and alage
-oxidizes
-the active killing form of chlorine in water
✔✔free chlorine - ✔✔the active available disinfectant in the water
FC= HoCl + OCl-
✔✔combined chlorine - ✔✔forms when free chlorine reacts with 2 types of
contaminants in the water
✔✔pathogens - ✔✔bacteria, fungi, viruses and protozoan parasites
✔✔available chlorine content (acc) - ✔✔-comparison of the relative amount of chlorine
released into water for different chlorine disinfectants
-developed using chlorine gas as the standard reference of 100%
✔✔active chlorine percentage - ✔✔the percentage by weight of the technical grade
active ingredient in the product
✔✔how does sodium hypochlorite raise the water's Total Dissolved Solids? - ✔✔by
adding sodium (Na+) and chloride (Cl-) ions to the water
✔✔sodium hypochlorite (NaOCl) - ✔✔-liquid chlorine releasing disinfectant that is the
most common disinfectant used
-active strength: 10-12%
-ACC 10-12%
-pH 9-14
✔✔calcium hypochlorite is used to - ✔✔superchlorinate the water
✔✔calcium hypochlorite - ✔✔-dry form of chlorine
-class 3 oxidizer
-continuous use may result in high calcium levels
-pH 8.5-11
✔✔lithium hypochlorite (LiOCl) - ✔✔-dry, granular compound of chlorine
-rapidly and completely soluble
-use for superchlorination
-class 1 oxidezer
✔✔chlorine generation - ✔✔in line generation
brine method
✔✔chlorine gas - ✔✔-effective disinfectant
AND QUESTIONS SET A+
✔✔protozoa - ✔✔cryptosporidium
giardia
✔✔bacteria - ✔✔shigella
E. coli
✔✔viruses - ✔✔norovirus
adenovirus
hepatitis a
✔✔what is the response for formed stool? - ✔✔1. raise the free available chlorine level
to 2 ppm and ensure the pH is 7.5 or less at 77 deg. or higher
2. maintain the chlorine concentration for at least 25 min before opening the pool
3. ensure the filtration system is operating while the pool reaches and maintains the
proper free chlorine concentration
✔✔what is the response for diarrheal discharge? - ✔✔1. raise the free available
chlorine level to 20 ppm
2. maintain the pH of 7.5 or less at 77 deg. or higher
3. maintain the pH and chlorine level for 12.75 hours
4. backwash the filter after full disinfection time
5. return the chlorine level to normal levels
✔✔Contamination Time (CT) value - ✔✔-the concentration of free chlorine in ppm times
time in min
✔✔what is the CT value for giardia? - ✔✔45
✔✔what is the CT value for crypto - ✔✔15,300
, ✔✔hypochlorous acid (HCl) - ✔✔-inactivates pathogens and alage
-oxidizes
-the active killing form of chlorine in water
✔✔free chlorine - ✔✔the active available disinfectant in the water
FC= HoCl + OCl-
✔✔combined chlorine - ✔✔forms when free chlorine reacts with 2 types of
contaminants in the water
✔✔pathogens - ✔✔bacteria, fungi, viruses and protozoan parasites
✔✔available chlorine content (acc) - ✔✔-comparison of the relative amount of chlorine
released into water for different chlorine disinfectants
-developed using chlorine gas as the standard reference of 100%
✔✔active chlorine percentage - ✔✔the percentage by weight of the technical grade
active ingredient in the product
✔✔how does sodium hypochlorite raise the water's Total Dissolved Solids? - ✔✔by
adding sodium (Na+) and chloride (Cl-) ions to the water
✔✔sodium hypochlorite (NaOCl) - ✔✔-liquid chlorine releasing disinfectant that is the
most common disinfectant used
-active strength: 10-12%
-ACC 10-12%
-pH 9-14
✔✔calcium hypochlorite is used to - ✔✔superchlorinate the water
✔✔calcium hypochlorite - ✔✔-dry form of chlorine
-class 3 oxidizer
-continuous use may result in high calcium levels
-pH 8.5-11
✔✔lithium hypochlorite (LiOCl) - ✔✔-dry, granular compound of chlorine
-rapidly and completely soluble
-use for superchlorination
-class 1 oxidezer
✔✔chlorine generation - ✔✔in line generation
brine method
✔✔chlorine gas - ✔✔-effective disinfectant
