A micron or micrometre is 1x10-6 of a metrealso written as 0.000001m. In filtration the micron rating is the minimum particle size the media will filter and is determined by the Beta Rating at that size.

Simply put the Beta rating, β, is the efficiency of the media within the filter element and is written as the number of particles that will pass through the element and into the system.

Bypass pressure relieve build-up of pressure within the system and allows medium to bypass the element when pressure increases and reaches a sufficient level.