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I have afe dry as well. I don't want to have to oil the filter when cleaning it.
Some generalities to consider:
More surface area, better overall flow.
Better filtration from media, less efficient flow.
Greater capacity media, longer you can run the filter efficiently.
Oiled media generally has higher efficiency and capacity, but doesn't collect the smaller particulates as well as non-oiled media It works by bending air around sharp corners and flinging dirt into the oil in the filter, trapping the dirt. Having the right amount of oil is critical to filter performance
Non-oiled, or dry, media forces air through small openings which physically catch dirt particles and hold them in place. Less efficient, but more predictable and consistent filtration.
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