325 mesh is a sieve with o,o44 mm openings.
There are approximately 37 microns in one mesh of 400.
80 mesh size is equal to approximately 180 microns.
There are 1000 microns in a mm. There are 5000 microns in 5 mm
There are approximately 0.0059 inches in 150 microns.
There are 0.125 millimeters in 125 microns. This conversion can be done by dividing the number of microns by 1000, since there are 1000 microns in a millimeter.
149 microns is 100 mesh
There are approximately 37 microns in one mesh of 400.
80 mesh size is equal to approximately 180 microns.
.044mm
4 microns is smaller. 600 messh related to openings per square inch. The thickness of screen wire must be reduced from this opening size. For example, 500 mesh screens are rated to have an average 25 microns opening size. For 600 mesh this comes to approximately 21 microns.
I found a Water Quality Standards chart for a geothermal heat pump and one part of it says "Filtered fo maximum 800 microns [800mm, 20 mesh] size." So I would guess its 20.
Mesh size is usually used in the US. It's just an alternative system used to describe the hole size. For example, 35 mesh (US) is the same as 0.5mm or 500 microns.
http://www.fdpp.com/FAQ.htm "Actually there isn't any since a strainer is, in reality, a coarse filter. The question is then one of semantics. Generally it is assumed that if the particle to be removed is not visible to the naked eye, the unit is filtering, and if the particle is visible, the unit is straining. The average human eye can detect a specific particle between 50 and 70 micros. Most people cannot see anything smaller than 325 mesh, or 44 microns. Since 200 mesh is equivalent to 74 microns, a general rule would be that if the screening device is coarser than 200 mesh, it is a strainer and if it is finer than 200 mesh it is a filter." - Factory Direct Pipeline Products Website
10 Microns.
109 microns 1.000.000.000 microns
914400 microns
1mm is 1000 microns