^ what he said...
I'm in almost the same predicament...
I have 2 large jars of dry sifted kief extracted using a 220µ(micron) bubble bag.
I need to refine it by removing plant matter, the stalks, husks, and leaf matter ...
In order for me to do this correctly...
First step is a nice long cure...I'm shooting for a year of total cure time (currently at about 6 months..)
Then, I plan on using dry sieving techniques to collect the cured resin heads.
I personally want a couple of dry sieving screens for this purpose.
If I were on your shoes...
I would get on E_ay or Am_zon and but yourself a 220µ bubble bag aka” work bag”
Seen them as cheap as 10$ per bag and as high as 30$...
You get what you pay for in this capacity..
Would you mind elaborating on how you would use a pillow case?
The fabric is woven very tight on most pillow cases, and would not allow anything to pass through.
Poke holes in the fabric?