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trommel screen

nbsp018332a trommel screen also known as a rotary screen is a mechanical screening machine used to separate materials mainly in the mineral and solid waste processing industries it consists of a perforated cylindrical drum that is normally elevated at an angle at the feed...

how to make a water filter with pictures

nbsp018332how to make a water filter water is essential to life this technique is very useful when you are hunting to survive people can live up to a week without food but only two to three days without water clean water can be hard to find if...