There are three important properties to be considered relative to choosing the right filter media: Efficiency at a specified micron size, initial pressure restriction, and dirt holding capacity at a specified flow rate.
When specifying media it is important to understand what efficiency the filter is designed to remove of a given micron particle size. To help in the selection process H&V can provide efficiency curves on some of our media which clearly indicates the efficiency of the media at different micron sizes at a specified flow rate.
The initial pressure drop or flux of the media must be considered. In general there is a tradeoff between efficiency and flux or pressure drop. As the efficiency is increased the flux decreases. In choosing the correct media for your application you want a media with the desired efficiency for the micron rating at the lowest pressure drop as possible to get the maximum flow rate with the least amount of energy.
Dirt holding capacity is also important in determining the life of the filter in use and should be taken into consideration when choosing the most suitable media.