Have you ever seen a mortar and pestle where the bottom of both are encrusted by a hard layer of pulvermized medication? It becomes the medicinal melting pot. Putting horses at risk of getting medication they don’t need or shouldn’t have.
One solution – Use a large coffee filter to line the bowl! I also will wrap another one around the pestle. You can grind away and you won’t tear through them! Then you can easily fold the filter edges together to make a funnel so that you can easily pour your powder into your dosing syringe or top dress grain. Then throw them away. Its so easy and inexpensive! I have used this trick at my veterinary practice for years, which is especially important since we are grinding lots of different medications for multiple patients per day.