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Flashcards in Disinfection Deck (8)
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1

What does 'free' chlorine mean?

Chlorine that has not yet combined with pollution.

2

What does 'combined' chlorine mean?

Chlorine that has combined with pollution and is therefore no longer 'free'.

3

What does 'total' chlorine mean?

The amount of free chlorine plus the amount of combined chlorine.

4

How is the free chlorine measured?

With the use of a DPD1 reagent and a comparator or photometer.

5

How is the total chlorine measured?

With the use of a DPD3 reagent and a comparator or photometer.

6

How is the combined chlorine measured?

By taking away the free chlorine reading form the total chlorine reading.

7

What is the recommended free chlorine level for a swimming pool and a spa pool?

1 - 3 mg/l for a swimming pool

3 - 5 mg/l for a spa pool

8

What is the recommended combined chlorine level?

No more than half the free chlorine level and also no more than 1 mg/l.

Both conditions have to be met.