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From the study of the filtration capabilities of the filter paper from the fibers of straw, the rice and water hyacinth have the appearance of a filter paper that is made of straw. 40 grams can be the best air filter, it is because the thickness of the filter paper is made of straw. 40 g. The density of the fibers in the filter makes the gap between the line lines are low. A large dust or dirt can not go through the gap. So the filter paper is made of straw. 40 g. It is best to filter dust. ...
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