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PrecoatA thin layer, 1.5 to 3.0 mm, of filter aid that is applied to the septum before the actual filtration process. A precoat is typically used in filter aid filtration when the following is needed:
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PrecoatApplication of a free-draining, noncohesive material, such as diatomaceous earth, to a filtering medium. Precoating reduces the frequency of media washing and facilitates cake discharge.
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PrecoatMaterial added to the air stream on initial process start-up to aid in establishing an initial dustcake on the filter bags.
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