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The Ryco R2132P CAV filter is 15 micron too. But only at Beta 75, or 98.7% efficiency. Which means the filter will let approx one out of every 75, 15 micron particles to pass through the filter. Definitely. not the type of filter you would use for a Common rail engine. Still ok for the old TD clunkers though.
Bit of useless info but, a grain of table salt is around 100 micron, the smallest the human eye can see is around 40 micron.
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