I just moved my horse into a barn with a wonderful indoor arena. The barn owner recently had the footing stripped, leveled, scraped and then he used a yellow-colored, powder-like sandy footing. I was told it was called "ag-lime". I had never before seen footing with such a light yellow color.
Here's my question: Are there any known respiratory (both horse and human) health risks associated with riding in an indoor arena with this type of footing? Is this substance something I would need to rinse off my horse's hooves and/or legs after riding in there?