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Using a rolling pin is an easy way to crush the egg shells. Put them in a Ziploc bag and roll until they are fine; another good use for Ziploc bags you have washed to reuse again.
I have been using a blender to crush the shells. Your way is much better, and with less mess.
Okay, as simple as this sounds, I hadn't thought of this, and it will be very useful for me, as my Weimeraner loves to eat the egg shells I put out for plants. I've stopped putting them out because its such a problem to keep her out of them- I'm always afraid they'll cut the lining of her stomach or intestines.
I tried the blender and it created so much dust, I didn't do it but once. My daughter suggested this to me when she saw me crushing them with my hands. It works like a charm.
Ha Ha! You were suppose to put water in the blender.