and microorganisms from mask.
There are a wide variety of precoat filter processes but all share the same basic cycles known as: 1) precoating; 2) service with bodyfeed; 3) backwash or cleaning.
The first and essential step in the precoat cycle is to establish a uniform and stable cake where DE in slurry form is recycled through permanent elements (septums) back to the clean tank. When purity is confirmed, service flow commences.
At this point, a continuously metered amount of DE called body