Pollution

Question 1

What is meant by relative pollution?

Answer 1

The amount of pollution in a body of water, relative to the amount of water.

Question 2

What are the three main pollution groups?

Answer 2

Physical

Chemical

Biological

(tip: think of the 3 main sciences; physics, chemistry, biology)

Question 3

Where is most (up to 75%) of the pollution in a swimming pool?

Answer 3

In the top 150mm of water.

Question 4

Which of the pollution groups does urine belong in?

Answer 4

Chemical

Question 5

Which of the pollution groups does bacteria belong in?

Answer 5

Biological

Question 6

Which of the pollution groups does algae belong in?

Answer 6

Biological

Question 7

Which of the pollution groups does grit belong in?

Answer 7

Physical

Question 8

How do you control physical pollution

Answer 8

By mechanical/physical means (netting, scooping, skimming, filtering etc.)

Question 9

How do you control chemical pollution?

Answer 9

Dilution (introducing fresh water into the pool).

Question 10

What is the recommended rate of dilution?

Answer 10

30 litres of fresh water per bather, per day.

Question 11

How do you control biological pollution?

Answer 11

Disinfection