CPO Water Testing and Analysis 2

Question 1

What is the recommended pH range for public swimming pool water according to standard CPO guidelines?

Accepted Answer

7.2–7.8

Answer

The CDC and PHTA recommend maintaining pool pH between 7.2 and 7.8 for effective disinfection and swimmer comfort.

Question 2

What is the standard target range for total alkalinity in a public swimming pool?

Accepted Answer

80–120 ppm

Answer

Total alkalinity should be maintained between 80 and 120 ppm to stabilize pH and prevent rapid fluctuations.

Question 3

Which of the following does a DPD (N,N-diethyl-p-phenylenediamine) test kit measure?

Accepted Answer

Both free chlorine and total chlorine

Answer

DPD reagents measure free chlorine directly; adding a second reagent (potassium iodide) allows measurement of total chlorine to calculate combined chlorine.

Question 4

What is the recommended calcium hardness range for swimming pools to prevent corrosion and scale formation?

Accepted Answer

200–400 ppm

Answer

Calcium hardness between 200 and 400 ppm protects pool surfaces from corrosive low-calcium water and prevents scale deposits from high-calcium water.

Question 5

When using a DPD test kit, the presence of free chlorine causes the water sample to turn which color?

Accepted Answer

Pink or red

Answer

DPD reagent reacts with free chlorine to produce a pink-to-red color; the deeper the color, the higher the chlorine concentration.

CPO (Certified Pool Operator Exam) Practice Test

CPO (Certified Pool Operator Exam) Practice Test

CPO Water Testing and Analysis 2