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That sounds a little like what diatomaceous dust does - eat plenty of eggs, so will also give this ago. Coffee and eggs and some of @owl recommended pellets!
Tenderloin
@JonD
We have hens next to our veg patch and therefore have loads of egg shells in our compost heap. Consequently lots of tiny bits of broken eggshell in the beds when we put the compost out. We notice hardly any slugs/snails which I am fairly confident is because the sharp edges of the shell fragments keep them off the beds. My suggestion for anyone is collect loads of eggshells, grind up and sprinkle liberally around plants or over pots. It works for protecting seedlings in pots too.