Certified Pool Operator Practice Test

How often should the chlorine level in a public pool be tested during heavy use?

1. Every 2 hours

2. Every 4 hours

3. Hourly

4. Twice a day

The correct answer is: Every 2 hours

During heavy use, the chlorine level in a public pool should be tested more frequently because more people are using the pool, potentially introducing more contaminants into the water. Testing every 2 hours ensures that the chlorine level remains at a safe and effective level to keep the pool clean and prevent the spread of waterborne illnesses. Option B is incorrect because 4 hours is a longer interval and may not catch any sudden changes in the chlorine level. Option C is incorrect because hourly testing may be too frequent and may lead to excessive use of chlorine. Option D is incorrect because testing only twice a day may not be enough to maintain a safe and clean pool during heavy use.