Air Filtration – the most common objectives are purification (either incoming or outgoing) and recovery of a product. In some applications, the two can be combined for beneficial results. Many installations made for purposes of air pollution control have resulted in the recovery of a usable product. Liquid Filtration – the three main objectives are refining a product, recovering a product and clarifying the filtrate. Filter cloth qualities for liquid filtration would include the ability to prevent passage of a solid material, allow an even flow of liquid, resist plugging, and ease of filter cake removal.

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