Question 6020 of 229 · California Water Distribution Operator Exam
Why are Giardia and Cryptosporidium difficult to control with chlorine alone?
Exactly one answer is correct.
You got of questions right. Here on the question pages nobody remembers which ones you got wrong. The trainer saves your progress and asks the mistakes again until they stick.
Or free: the 10 questions most people get wrong
Show solution
Correct answer to question 6020
- C: Their cysts and oocysts are highly resistant to chlorine
Explanation
These protozoa are removed by filtration and treated by UV or ozone. That is why surface water systems must filter.
More questions: Water Quality and Water Sources
- 6021Which disease is caused by a waterborne protozoan?
- 6022A customer reports a rotten-egg odor from the hot water tap only. What is a likely cause?
- 6023Which customer complaint is most often caused by iron corrosion products stirred up by a flow change?
- 6024What is the purpose of unidirectional flushing?
- 6025Under 22 CCR 64575, what is the minimum flushing velocity that must be maintained in a main?
- 6001What are pathogenic organisms?