# FREE CPO Operation and Maintenance Part 1 Questions and Answers

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#### Pools using chlorine gas as a disinfectant produce hydrochloric acid, which can be neutralized with:

Correct! Wrong!

Explanation:
Pools using chlorine gas as a disinfectant can produce hydrochloric acid. To neutralize this acid, caustic soda or soda ash is commonly used. These substances help maintain the pH balance of the pool water and ensure it remains safe for swimmers.

#### Vacuuming of the pool bottom should be done:

Correct! Wrong!

Explanation:
Vacuuming of the pool bottom should be done after the foreign matter has settled. This ensures that any debris, dirt, or other contaminants that have settled to the bottom of the pool are effectively removed. Waiting for foreign matter to settle allows for more efficient vacuuming, as it prevents the stirred-up debris from immediately resettling before it can be removed. Regular vacuuming helps maintain the cleanliness and hygiene of the pool, ensuring a safe and enjoyable swimming environment for users.

#### A round pool with a 20' diameter and a water depth of 5'-4" contains gallons of water.

Correct! Wrong!

Explanation:
Solution: Volume (gals.) = 3.14 x r x r x depth x 7.50
Gals = 3 14 x 10x 10 x 5.33 x 7.50 = 12,552.15

#### To be classified as a disinfectant, a compound must kill or inactivate 99.9% of contaminants as well as:

Correct! Wrong!

Explanation:
To be classified as a disinfectant, a compound must not only kill or inactivate 99.9% of contaminants but also leave a measurable residual in the water. This residual ensures that the water remains protected against microbial growth and contamination between treatments. A disinfectant with a measurable residual helps to maintain water quality and safety over time, providing ongoing protection for swimmers.

#### A rectangular swimming pool measuring 30' long by 15' wide with a water depth of 3' on the shallow end and 6' on the deep end will contain gallons of water.

Correct! Wrong!

Explanation:
Solution: Ave depth = 6 + 3 ÷ 2 = 4.5 <br vol.(gals )=LxWxDx 7.50 <br 30 x 15 x 4 5 x 7.50 = 15,187.50

#### A spa with water tested as pH 7.2, temperature 103, calcium hardness 600, total alkalinity 120, and TDS of 1,500 will be:

Correct! Wrong!

Explanation:
With a pH of 7.2, temperature of 103°F, calcium hardness of 600 ppm, total alkalinity of 120 ppm, and total dissolved solids (TDS) of 1,500 ppm, the water is likely to be scale forming. A pH of 7.2 is within the acceptable range, but the high calcium hardness and total dissolved solids levels indicate a potential for scale formation, especially in a hot environment like a spa. Adjustments to reduce calcium hardness and TDS may be necessary to prevent scaling issues.

#### Which of the following would not be considered an acceptable ADA access method?

Correct! Wrong!

Explanation:
The third option would not be considered an acceptable ADA access method. The Americans with Disabilities Act (ADA) requires accessible entry methods for pools, and corner steps with a vertical rise of less than 11 inches do not meet the ADA standards for accessible entry. ADA-compliant access methods include pool ramps, zero-depth entry levels, and portable lifts, which provide equitable access to individuals with disabilities.

#### A spa with an 8' diameter having a water depth of 2'-8" will contain pounds of water.

Correct! Wrong!

Explanation:
Solution.: Volume (lbs.) = 3 14 x r x r x depth x 62.4
lbs = 3 14 x 4 x 4 2.67 x 62.4 = 8,370.39

#### The only physical factor that affects water balance is:

Correct! Wrong!

Explanation:
Temperature is the only physical factor that affects water balance. Temperature influences the saturation index, which is a measure of the water's tendency to deposit or dissolve calcium carbonate. As temperature increases, the saturation index tends to decrease, leading to the potential for scaling or corrosive water conditions. Adjustments to other parameters like pH, total dissolved solids (TDS), and calcium hardness may be necessary to maintain proper water balance in response to changes in temperature.

#### When performing a color-matching water test, when using the comparator, you should:

Correct! Wrong!

Explanation:
When performing a color-matching water test using a comparator, you should hold the sample up to the northern horizon or a daylight illuminator. This provides consistent lighting conditions, ensuring accurate color comparison between the sample and the standard color discs in the comparator. Holding the sample up to the northern horizon or a daylight illuminator helps minimize glare and variations in lighting, allowing for precise color matching.

#### A round pool with a 25' diameter contains square feet of surface area.

Correct! Wrong!

Explanation:
Solution: A= 3.14 x r x r
A = 3.14 x 12.5x 12.5 = 490.63