High Efficiency Filters
These in-line filters are great if you're looking to conserve energy and filter particulates as small as 0.01 microns. High efficiency air line filters are ideal for painting applications to eliminate concern of "fish-eye" flaws in paint finishes.
High efficiency air line filters are designed to filter more water, oil, and contaminants than other filters while still reducing pressure drop.
Water Separator Filters
These air line filters are generally used when the main contaminant in your air is water. However, many of them are also able to filter out dirt and oil.
In addition to trapping water at the bottom of the filter bowl, water separator filters also reverse air-flow direction 180-degrees inside the filter and pass it through a stainless steel mesh element.