Originally Posted by Kiril
Don't screen it at all ... 1/2" is acceptable IMO.
Seems to me any "cheap" solution will not be very scalable or cost effective. I suppose if you only need to do 1 yard of compost per month, not a big deal .... 100 yards + of compost per month makes it an entirely different game.
You are probably right for most situations, but I have a unique reason for wanting it screend down to smaller sizes. I have tried to find a way to efficently mix compost in my hydroseeder for seeding applications. The cheap compost with larger pieces simply causes more cloggs than its worth. 1/8 inch compost seems to be pretty acceptable. Screening down to that size can be a problem, but I think I have the moisture problem figured out.
Two options. One, add a brush attachment to rub against the outside of drum as it turns, this will pull the small particles thru the screen. This works on moist clay dirt and should work on compost.
Second option, spray more water and make a slurry. This would wash the small particles thru the screen, but would require doing quanities in advance and letting the material dryout before appying to a lawn. Even if used in the hydroseeder, handleing the extra weight of wet compost isnt my ideal of a fun day. Not to mention the possible loss of nutrients. Wait, make compost tea with the extra water.