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Here is a good article about calcium supplementation and particle size. It's got links to more references at the bottom as well. http://www.the-chicken-chick.com/for-strong-eggshells-size-matters/

I'm not saying don't feed the eggshells back to them. I do this myself. I'm just saying it's not necessary to put them in the blender first. I just collect them in a bowl on the counter and when the bowl is full, crush them with my fist a maybe 3-4 times and then give them back to the flock.

I'm happy with my kitchenaid blender. I'm not sure if they still make the same model, but it's similar to this one. Although this one looks to be plastic, mine is glass. https://www.kitchenaid.com/countertop-appliances/blenders/blender-products/p.5-speed-classic-blender.ksb1570sl.html Also...