Storm in a teabag?

http://www.sp.edu.sg/schools/be/dcse/content/links/communities/CourseFamiliarisationProg_080104/cfp2004_files/pa.JPG

A good demonstration of filtration is the humble teabag. In the
commonly known happening, when hot water is poured into a cup with a
teabag, the tea leaves remain in the teabag and the teabag acts as a
filter, preventing the tea leaves from entering into the tea drink and
thus there are no tea dregs to spoil your drink.

This is the basis of newater although, what we demonstrate with a
teabag is on a very macro scale compared with the RO membrane. But it
is the same, in that bigger 'tea leaves' cannot pass through the
'teabag'. This is basically what a filter does. It does not allow big
things to go through.

In the Singapore poly picture shown above, we can see that sewage is
different from tap water or newater.

It might surprise you to know that tap water can and is commonly
further filtered by Singaporean housewives. They buy a cheap tap filter
from the market and this turns brown presumably from rust after less
than a week, and is replaced frequently. But tap water is generally
considered clean enough to drink and to rinse the mouth in despite
this.

In this write-up, we have shown what a filter is - it separates the
'tea leaves' which we don't want from what we want. It is a separator
of 'big tea leaves' from us.

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Relevant Pages

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