I have about 40 bags of pellets that have varing degrees of unusable pellets due to exposer to moister. I don't want to just throw them all out becuase probably half the pellets are just fine. What I would like to do is set up a screen that will alow the unusable fines and sawdust to fall through and save the good pellets. Any idea what size mesh I should use? Any other ideas on how to salvage what I have? Thanks.