One can purchase some sifters both in local and online stores
such as the following; SPI or Special Project, BOE or
Bid-on-Equipment and Aaron Equipment Company.
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Clay in which the particles can go through the smallest
sifters.
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Yes, they sift through sand in search of tiny bits of algae to
eat.
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people sifted throught the water(boiled it) -removes germs-☺
created big sifters (put them in rivers