Page 320 from Mcmaster - Carr;
Micron Ratings— Absolute-rated filter bags will retain at least 90% of particles of the specified micron size
. All other bags will retain particles, but not to any percent efficiency. Often referred to as nominal rated. To achieve the desired filtration, select a bag with a micron size smaller than the particles you want to filter.
Bags with a glazed finish have minimal fiber migration (contamination from fiber filter media, such as felt). Filter bags are not reusable, unless noted. To order a filter bag for your housing, use the following tables as a guide.
The polish is the final filter, the lowest absolute micron you want the fuel to be filtered to.
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Originally Posted by Austin85
What is an absolute bag? And what is the final polish?
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