Specialty Gardening: Container Soils - Water Movement and Retention III , 1 by tapla

tapla wrote:
From a technical perspective, Turface MVP is just a little too small to be perfect in the gritty mix, but it's as close to perfect as I've found. If you screen the fines out through insect screen, the remainder isn't small enough that it clogs the air pores between the larger ingredients, which make up 2/3 of the mix. Basically, we make a little compromise in using Turface a little smaller than perfect so we get more usable product from a bag.

Here's how I screen:

Al