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The reason the fleece (polyester) filter is specified for extended drain intervals is due to a whole host of reasons but primarily due to longevity---up to 15 times longer for fleece vs. cellulose according to Mann/Hummel at this link.
https://www.mann-hummel.com/company/upload/doc/HBAAEJwjOMP.pdf Based on the info here I would use fleece where available even if the drain intervals are not extended. Mark |
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