Question

2. Impure water can be filtered by using physical barriers known as ________. *

a) Filter paper
b) Activated carbon
c) None of these
d) Both a and b

Answer 1

Answer:

d) Both a and b

Reason:

The reason that activated charcoal makes such a great material for water filters is that it is natural and effective at removing many toxins from the water, such as volatile organic compounds and chlorine, without the use of chemicals or stripping the water of salts and minerals.

The interest in the use of biobased filters for water purification has increased in recent years, as such filters have the potential to be affordable, lightweight and biodegradable. ... An option for simple biobased POU water filtration is to use paper filters made of cellulose fibres.

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