Larry Jackson wrote:I read that the washed eggshells may be ground into a fine grit like fine cornmeal as an amendment to feed for the worms to aid in their digestion and calcium.
It may be that the worms need fine grinding. But for feeding to
chickens or putting into compost, my mom just kept the eggs in a
coffee can (metal, this was a long time ago) and crunched them up from time to time with the bottom of whatever glass bottle was handy on the counter. (Improvised mortar and pestle.) She got them down to the point where the biggest pieces were about the size of a grain of rice.
I don't have
chickens, but I've been thinking that including eggshell grit in the mix we feed our wild birds might help their reproductive success.