When we were seeing Spec Sheets from Purolator/M-H, the PureOne was typically shown to be anywhere from 99% @ 25u to 40u depending on model.$5.50 for mine. 99%@20um, silicon ADBV? If there constructed OK thats a good price?
Purolator has removed the Boss ISO 4548-12 efficiency claim from their website, and shows that their base filter (red can) is "ISO 4548-12 at 20 microns on L30001" which I have a tough time believing.
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