Sieve size, and where to buy?

[Mte320]

Where do you by Sieve´s

What sizes should i get?
And is it really possible to get the very fine dust out of the media?

 

[rtbcomp]

I made mine with mesh bought from The Mesh Company http://www.themeshcompany.com/

I think I use 64 mesh (64 holes per linear inch) to sieve dust out. I built a motorised sieve, although to be honest I don't bother with sieving the dust, I just let the dust extractor deal with it.