We have a sample from kress machines(slab hauler)which contains ecosafe fr-46. We have filtered down to one micron absolute and cannot get the ISO Code at 4 um down below ISO Range number 22. An on-line particle counter was used to measure as well as a light blockage laser particle counter in the lab to verify. Results were very similar at the 4 um size range. It doesn't appear to be air or the result of water contamination. We have other systems in our plant we have the same fluid and we can get 15/12/7 counts..something is up and we can't figure it out...any ideas anyone?
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