Podcast
Questions and Answers
Which type of filter requires the least amount of water to clean?
Which type of filter requires the least amount of water to clean?
Cyanuric acid (stabilizer) protects free chlorine (FC) against the effects of:
Cyanuric acid (stabilizer) protects free chlorine (FC) against the effects of:
An erosion chemical feeder is what type of feeder?
An erosion chemical feeder is what type of feeder?
OSHA requires aquatic facilities to maintain:
OSHA requires aquatic facilities to maintain:
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When mechanical cooling is used on an indoor therapeutic pool facility, the recommended ASHRAE fresh air exchange rate should be:
When mechanical cooling is used on an indoor therapeutic pool facility, the recommended ASHRAE fresh air exchange rate should be:
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What condition mandates an immediate closure of your swimming pool?
What condition mandates an immediate closure of your swimming pool?
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The reagent commonly used to test pH is:
The reagent commonly used to test pH is:
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When should you backwash high rate sand filters that have a single pressure gauge?
When should you backwash high rate sand filters that have a single pressure gauge?
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Oxidation Reduction Potential testing (ORP) is measured in:
Oxidation Reduction Potential testing (ORP) is measured in:
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How much sodium thiosulfate would you need to lower the free chlorine from 18 ppm to 2.0 ppm in a 150,000 gallon pool?
How much sodium thiosulfate would you need to lower the free chlorine from 18 ppm to 2.0 ppm in a 150,000 gallon pool?
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Evaporation heat losses from a pool are highest under which environmental condition?
Evaporation heat losses from a pool are highest under which environmental condition?
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The daily opening checklist should be used to:
The daily opening checklist should be used to:
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You have a 25,000 gallon hotel pool with a calcium hardness level of 170 ppm. How much calcium chloride (77%) would be required to increase this to 250 ppm?
You have a 25,000 gallon hotel pool with a calcium hardness level of 170 ppm. How much calcium chloride (77%) would be required to increase this to 250 ppm?
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Which chemical is used to lower the pH value of pool or spa water?
Which chemical is used to lower the pH value of pool or spa water?
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In a circulation system, the commonly accepted practice is to have:
In a circulation system, the commonly accepted practice is to have:
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There is a diarrheal accident in a 206,000 gallon pool. According to the CDC, the first step you should take to correctly handle this incident is:
There is a diarrheal accident in a 206,000 gallon pool. According to the CDC, the first step you should take to correctly handle this incident is:
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If you have sand from your filter returning to the pool through the inlets, what is the likely cause?
If you have sand from your filter returning to the pool through the inlets, what is the likely cause?
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Which procedure is used to determine the level of combined chlorine in water?
Which procedure is used to determine the level of combined chlorine in water?
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You are the operator for a pool which is 75 feet long and 48 feet wide. The pool bottom has a constant slope which is 4 feet deep at the shallow end, and 6 feet deep at the deep end. What is the volume of this pool in gallons?
You are the operator for a pool which is 75 feet long and 48 feet wide. The pool bottom has a constant slope which is 4 feet deep at the shallow end, and 6 feet deep at the deep end. What is the volume of this pool in gallons?
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You operate a pool which uses high rate sand filters. You discover that your filter tank has developed a major leak and must be replaced. Your pool operates with a flow rate of 625 gpm. Using a filter media t=rate (FMR) of 12 gallons per minute, what size sand filter would you need to replace your damaged filter?
You operate a pool which uses high rate sand filters. You discover that your filter tank has developed a major leak and must be replaced. Your pool operates with a flow rate of 625 gpm. Using a filter media t=rate (FMR) of 12 gallons per minute, what size sand filter would you need to replace your damaged filter?
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What is the best practice to prevent algae growth?
What is the best practice to prevent algae growth?
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The presence of galvanic corrosion in water is signaled by:
The presence of galvanic corrosion in water is signaled by:
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If there is a diarrheal incident in your pool, according to the CDC, you must raise the free chlorine level to 20 ppm and keep it there for:
If there is a diarrheal incident in your pool, according to the CDC, you must raise the free chlorine level to 20 ppm and keep it there for:
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Which chemical could be added to lower the chlorine level in the water?
Which chemical could be added to lower the chlorine level in the water?
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At your swimming pool, failure to provide the appropriate standard of care to the public can lead to a case of:
At your swimming pool, failure to provide the appropriate standard of care to the public can lead to a case of:
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To reduce the possibility of suction entrapment an operator should:
To reduce the possibility of suction entrapment an operator should:
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Cloudy or murky green-tinted pool water is usually an indication of:
Cloudy or murky green-tinted pool water is usually an indication of:
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The vacuum gauge is installed:
The vacuum gauge is installed:
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Which chlorine type tends to lower the pH level in the water?
Which chlorine type tends to lower the pH level in the water?
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To be classified as a disinfectant, a chemical must kill or inactivate 99.99% of contaminates and:
To be classified as a disinfectant, a chemical must kill or inactivate 99.99% of contaminates and:
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What is the likely result if the alkalinity of the pool water is greater than 180 ppm?
What is the likely result if the alkalinity of the pool water is greater than 180 ppm?
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Which chemical is used to raise the total alkalinity level?
Which chemical is used to raise the total alkalinity level?
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Legionnaire's disease is spread by:
Legionnaire's disease is spread by:
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Which type of filter system will remove the smallest particles?
Which type of filter system will remove the smallest particles?
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Before daily pool opening, what is the first area that should be inspected?
Before daily pool opening, what is the first area that should be inspected?
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Which filter media would not require a dust mask when handling and storing?
Which filter media would not require a dust mask when handling and storing?
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You operate a 50,000 gallon indoor pool, and your chemical test readings are: total available chlorine is 3.0, and free available chlorine is 1.5. How much calcium hypochlorite is needed to reach breakpoint?
You operate a 50,000 gallon indoor pool, and your chemical test readings are: total available chlorine is 3.0, and free available chlorine is 1.5. How much calcium hypochlorite is needed to reach breakpoint?
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What is the maximum spa water temperature typically allowed?
What is the maximum spa water temperature typically allowed?
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You readings for your pool are: total chlorine of 1.6; free chlorine of 1.5; pH of 7.4. According to the CDC, what action do you take if there is a solid stool fecal incident?
You readings for your pool are: total chlorine of 1.6; free chlorine of 1.5; pH of 7.4. According to the CDC, what action do you take if there is a solid stool fecal incident?
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In pre-coating a vacuum D.E. filter, what is the standard addition rate per 10 sq. ft. of filter surface area?
In pre-coating a vacuum D.E. filter, what is the standard addition rate per 10 sq. ft. of filter surface area?
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How many gallons of sodium hypochlorite would be needed to raise the free chlorine level from 3.0 ppm to 5.0 ppm in a 75,000 gallon pool?
How many gallons of sodium hypochlorite would be needed to raise the free chlorine level from 3.0 ppm to 5.0 ppm in a 75,000 gallon pool?
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Which of the following is NOT considered to be personal protective equipment?
Which of the following is NOT considered to be personal protective equipment?
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You are receiving complaints about a strong chlorine odor in the pool area, and several people have complained of eye irritation. The most likely cause is:
You are receiving complaints about a strong chlorine odor in the pool area, and several people have complained of eye irritation. The most likely cause is:
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The result of channeling in a sand filter includes:
The result of channeling in a sand filter includes:
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Ferrous ammonium sulfate (FAS-DPD) is what kind of test method?
Ferrous ammonium sulfate (FAS-DPD) is what kind of test method?
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Which is the best method to prevent electrocution?
Which is the best method to prevent electrocution?
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You are the operator of a 100,000 gallon outdoor pool. The water tests give you the following readings: total alkalinity is 75 ppm, pH is 7.6, calcium hardness is 200 ppm, temperature is 76 degrees F, and total dissolved solids is 1,100 ppm. What is the Saturation Index for this pool?
You are the operator of a 100,000 gallon outdoor pool. The water tests give you the following readings: total alkalinity is 75 ppm, pH is 7.6, calcium hardness is 200 ppm, temperature is 76 degrees F, and total dissolved solids is 1,100 ppm. What is the Saturation Index for this pool?
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Emergency Response Plans must include all of the following EXCEPT:
Emergency Response Plans must include all of the following EXCEPT:
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Where should the water sample be collected from for chemical testing?
Where should the water sample be collected from for chemical testing?
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You operate a wading (kiddie) pool which has 7,500 gallons of water. The health code requires your pool to operate on a 2-hour turnover rate. What would the flow rate required to achieve this turnover rate be?
You operate a wading (kiddie) pool which has 7,500 gallons of water. The health code requires your pool to operate on a 2-hour turnover rate. What would the flow rate required to achieve this turnover rate be?
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Study Notes
Water Treatment and Filtration
- Cartridge filters require the least amount of water for cleaning compared to other filter types.
- Cyanuric acid acts as a stabilizer by protecting free chlorine from ultraviolet rays.
- Erosion chemical feeders are classified as dry chemical feeders.
- When operating indoor therapeutic pools, ASHRAE recommends a fresh air exchange rate of 4 to 6 times per hour.
Pool Management and Safety
- OSHA mandates that facilities maintain Safety Data Sheets (SDS) for all chemicals used.
- Immediate pool closure is required when the main drain is not visible from the deck.
- A daily opening checklist is crucial to ensure all safety equipment is in place.
Chemical Testing and Handling
- Phenol red is the reagent commonly used for pH testing.
- Oxidation Reduction Potential (ORP) is measured in millivolts (mV).
- To lower free chlorine levels significantly, 39 lbs of sodium thiosulfate is needed for an 18 ppm to 2 ppm reduction in a 150,000-gallon pool.
- Testing for combined chlorine involves measuring total and free chlorine levels.
Environmental Conditions and Pool Maintenance
- Evaporation heat loss is highest during low relative humidity.
- Routine brushing of pool and spa walls is the best practice to prevent algae growth.
- Discoloration of submerged metal parts is a sign of galvanic corrosion.
Chlorine Management and Regulations
- In the event of a diarrheal incident, the first step is to remove all swimmers from the pool, followed by raising free chlorine to 20 ppm for 12.75 hours.
- Chloramines, formed from chlorine reacting with organic matter, are responsible for strong chlorine odors and eye irritation.
Flow Rates and Pool Design
- A 25,000-gallon pool at 170 ppm calcium hardness requires 24 lbs of calcium chloride to reach 250 ppm.
- The vacuum gauge should be installed before the pump in the circulation system.
Pool Operation Standards
- Personal protective equipment excludes fire extinguishers.
- The maximum spa water temperature is typically set at 104 degrees F.
Chemical Adjustments and Measurements
- The saturation index for a 100,000-gallon pool with specified chemical levels is calculated to be -0.2.
- Total alkalinity can be raised using sodium bicarbonate.
Emergency Procedures
- Emergency response plans must include alarm signals and staff procedures but do not need an opening and closing checklist.
- Water samples for testing should be collected 18 inches below the surface, away from return inlets.
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