CPO Pool Calculations and Formulas Questions and Answers 2

Question 1

A rectangular pool is 75 feet long, 42 feet wide, and has an average depth of 5.5 feet. What is the pool volume in gallons?

Accepted Answer

130,178 gallons

Answer

103,455 gallons

Answer

155,925 gallons

Answer

173,250 gallons

Question 2

How many pounds of calcium hypochlorite (65 percent available chlorine) are needed to raise the free chlorine by 2.0 ppm in a 50,000-gallon pool?

Accepted Answer

1.28 pounds

Answer

0.64 pounds

Answer

2.56 pounds

Answer

5.12 pounds

Question 3

A circular spa has a diameter of 8 feet and a uniform depth of 3.5 feet. What is its volume in gallons?

Accepted Answer

1,316 gallons

Answer

987 gallons

Answer

1,645 gallons

Answer

2,108 gallons

Question 4

What flow rate in GPM is required for a 120,000-gallon pool to achieve a 6-hour turnover?

Accepted Answer

333 GPM

Answer

200 GPM

Answer

267 GPM

Answer

400 GPM

Question 5

The Langelier Saturation Index of a pool reads negative 0.5. What does this indicate?

Accepted Answer

The water is corrosive

Answer

The water is perfectly balanced

Answer

The water is scaling

Answer

The water has too much chlorine

Question 6

A pool operator needs to lower pH from 7.8 to 7.4 in a 60,000-gallon pool. Approximately how much muriatic acid (31.45 percent HCl) is needed?

Accepted Answer

1 gallon

Answer

1 quart

Answer

Half a gallon

Answer

2 gallons