Too big kiryu to use

Hello all. I mistakenly purchase large size Kiryu can it be broken/ smashed to smaller size using a grate 1/8 to 1/4 and then used in my soil mix. Thanks gary

You will create a lot of dust, but you can crush it with a hammer or something heavy. Put it under heavy plastic or a tarp to keep the particles from flying everywhere. Be sure to wear eye protection too.