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That study was done with water, so he is making some assumptions when comparing H20 with air.

The test was of airflow not water, he was using a water manometer, which is a pressure differential measuring device that uses a water column to indicate the pressure change before and after the filter.

In other words, no water was passed through the filters, the water is part of the instrument.

Steve Carlson - 95 Trooper LS expo rig
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