Aquatics International University: Water Quality Course

2.

Which of the following should be monitored weekly?

Combined chlorine
Alkalinity
Cyanuric acid
All of the above

Correct Answer

A. All of the above

Explanation

All of the above should be monitored weekly because they are important parameters in maintaining the balance and cleanliness of a pool or spa. Combined chlorine is a measure of the chlorine that has reacted with contaminants in the water and is no longer effective in sanitizing. Monitoring this ensures that the chlorine levels are sufficient for proper sanitation. Alkalinity is a measure of the water's ability to resist changes in pH, and monitoring it helps to prevent pH fluctuations that can lead to water balance issues. Cyanuric acid is a stabilizer for chlorine and monitoring its levels ensures that the chlorine remains effective.

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3.

Optimally, free chlorine should be:

2.0 to 4.0 ppm
1.0 to 5.0 ppm
2.5 ppm
8.0 to 10.5 ppm

Correct Answer

A. 2.0 to 4.0 ppm

Explanation

Optimally, free chlorine should be maintained at a level of 2.0 to 4.0 ppm. This range ensures that there is enough chlorine present in the water to effectively kill bacteria and other harmful microorganisms, while also preventing over-chlorination which can be harmful to human health. This range is widely accepted as the optimal level for maintaining clean and safe water in various applications such as swimming pools, drinking water, and wastewater treatment.

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4.

Pool water that is reddish brown in color may be the result of:

High iron content
High levels of copper
Algae
Too much disinfectant

Correct Answer

A. High iron content

Explanation

Pool water that is reddish brown in color may be the result of high iron content. Iron can enter the pool water from various sources such as well water, rusted pool equipment, or iron-based pool chemicals. When the iron content is high, it can oxidize and form iron oxide, giving the water a reddish brown color. This can be visually unappealing and may also stain the pool surfaces. Testing the water for iron levels and implementing appropriate treatment methods can help resolve this issue.

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5.

Which of the following is NOT a factor in water balance?

Alkalinity
Hardness
Mineral content
Temperature

Correct Answer

A. Mineral content

Explanation

Water balance refers to the equilibrium between various factors in water, such as pH, alkalinity, hardness, and temperature. These factors affect the overall quality and suitability of water for different purposes. However, mineral content is not considered a factor in water balance. While minerals can be present in water and affect its taste and composition, they are not directly related to water balance.

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6.

If chlorine levels exceed requirements, you can neutralize the water by adding which of the following?

Hydrogen peroxide
Sodium thiosulfate
Sodium bicarbonate
Calcium chloride

Correct Answer

A. Sodium thiosulfate

Explanation

Sodium thiosulfate can be added to neutralize the water if the chlorine levels exceed requirements. This is because sodium thiosulfate is a reducing agent that reacts with chlorine, converting it into harmless chloride ions. Hydrogen peroxide is not suitable for neutralizing chlorine in water as it can react with chlorine to form harmful byproducts. Sodium bicarbonate and calcium chloride do not have the ability to neutralize chlorine.

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1

7.

Many state health codes recommend monitoring disinfectant levels:

Once an hour
Four times a day
Three times a day
Once a day

Correct Answer

A. Three times a day

Explanation

State health codes recommend monitoring disinfectant levels three times a day. This frequency allows for regular checks to ensure that the disinfectant levels are maintained at the appropriate levels throughout the day. Monitoring three times a day helps to prevent any potential contamination or health risks by ensuring that the disinfectant is effective in killing harmful bacteria and viruses. Regular monitoring also allows for prompt adjustments or interventions if the disinfectant levels are found to be inadequate.

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8.

For fecal accidents involving diarrhea, the free chlorine residual needs to be raised to ppm, and maintained for a period of at least hours.

60.0 ppm, 20 hours
20.0 ppm, 15 hours
8.0 ppm, 20 hours
20.0 ppm, 12.75 hours

Correct Answer

A. 20.0 ppm, 12.75 hours

Explanation

The correct answer is 20.0 ppm, 12.75 hours. When there is a fecal accident involving diarrhea, it is necessary to raise the free chlorine residual to 20.0 ppm. This elevated level of chlorine should be maintained for a period of at least 12.75 hours to ensure proper disinfection and elimination of any potential pathogens.

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9.

Bloodborne pathogens in a pool present a serious health risk.

True
False

Correct Answer

A. False

Explanation

Bloodborne pathogens are infectious microorganisms that can be present in blood and can cause diseases such as HIV, hepatitis B, and hepatitis C. While bloodborne pathogens can be a health risk in various settings, such as healthcare facilities or laboratories, they do not present a serious health risk in a pool. Pool water is typically treated with chemicals, such as chlorine, which effectively kills most pathogens, including bloodborne ones. Therefore, the statement that bloodborne pathogens in a pool present a serious health risk is false.

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10.

The calcium hardness of your pool water depends on:

Temperature and mineral content
PH and temperature
Alkalinity
PH

Correct Answer

A. pH and temperature

Explanation

The calcium hardness of pool water is influenced by the pH and temperature. pH refers to the acidity or alkalinity of the water, and temperature affects the solubility of calcium compounds. If the pH is too high or too low, it can lead to calcium scaling or corrosion. Similarly, temperature can affect the saturation level of calcium in the water. Therefore, maintaining the appropriate pH level and controlling the temperature can help regulate the calcium hardness of the pool water.

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Aquatics International University: Water Quality Course

When dealing with a fecal matter contamination, operators should NOT use a vacuum to remove the contaminants.

Quiz Preview

Which of the following should be monitored weekly?

Optimally, free chlorine should be:

Pool water that is reddish brown in color may be the result of:

Which of the following is NOT a factor in water balance?

If chlorine levels exceed requirements, you can neutralize the water by adding which of the following?

Many state health codes recommend monitoring disinfectant levels:

For fecal accidents involving diarrhea, the free chlorine residual needs to be raised to ppm, and maintained for a period of at least hours.

Bloodborne pathogens in a pool present a serious health risk.

The calcium hardness of your pool water depends on:

Aquatics International University: Water Quality Course

When dealing with a fecal matter contamination, operators should NOT use a vacuum to remove the contaminants.

Quiz Preview

Which of the following should be monitored weekly?

Optimally, free chlorine should be:

Pool water that is reddish brown in color may be the result of:

Which of the following is NOT a factor in water balance?

If chlorine levels exceed requirements, you can neutralize the water by adding which of the following?

Many state health codes recommend monitoring disinfectant levels:

For fecal accidents involving diarrhea, the free chlorine residual needs to be raised to ____ ppm, and maintained for a period of at least ____ hours.

Bloodborne pathogens in a pool present a serious health risk.

The calcium hardness of your pool water depends on:

For fecal accidents involving diarrhea, the free chlorine residual needs to be raised to ppm, and maintained for a period of at least hours.