That’s a good idea! Don’t know if I would want to ruin my coffee grinder but I like the idea! Maybe a mortar n pestle would be better and easier to wash!What I did though, was to put the MC through a strainer/sifter. What was left in the sifter were all those small hard balls of fertilizer. I then put those in my coffee grinder. Now my MC is an evenly ground powder, which should give me a more consistent nutrient application.