I need a small machine, gasoline powered or cordless electric, which can both reduce the size of items such as biochar and wood chips (ideally being able to produce different sizes of these materials with interchangeable screens) while also being able to shred up twigs, small branches, and dead plants for the compost pile. The machine can't be easily damaged by running material containing a bit of soil through it. (Potting mixes, etc.)
Is a hammermill shredder what I am looking for?
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