Question

Filtering contaminated water through a sari is

Answer 1

whats a sari?

Answer 2

It's "ineffective."

That means that it doesn't work.

This is because the germs that can make us sick are SO small,
they can go right through the sari,
and into our water containers. Which we then drink.

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@aaronq

A "sari" is a traditional cloth garment, worn by women in the middle east.

http://upload.wikimedia.org/wikipedia/commons/c/c1/Female_Model_in_Navel_exposing_Sari.jpg