Question

what is a common use of raw water that usually requires only screening?
service
firewater
boiler feed water
potable water
3 multiple choice 1 point
besides screening, what is one of the processes required to produce service water?
deionization
softening
chlorination
filtration

Explanation:

For the first question: Screening only removes large debris, which is sufficient for firewater since it only needs to be able to flow and extinguish fires without strict purity requirements. Other options need more treatment: service water needs additional processing, boiler feed water requires extensive treatment to prevent scaling, and potable water needs full purification (filtration, disinfection, etc.).
For the second question: Service water is used for non-potable industrial/utility needs. After screening, filtration is a standard next step to remove smaller suspended particles. Deionization and softening are for more specialized water needs, while chlorination is for disinfection (not a required universal step for service water).

Answer:

1. Firewater
2. Filtration