My kitchen sink has a garbage disposal unit. Underneath the sink there is a cabinet I use for storage. I noticed directly underneath the disposal unit a pile of sand-like debris of various size brown, grey, black, and tan in color. I cleared the debris. Several weeks or months later, I noticed the debris accumulating again. The debris is dry. My belief is that this is caused by the disposal unit, but I really have no idea where it comes from. What is this stuff? How do I prevent it? If not, do you have any good solutions to catch the debris as it accumulates so I can easily dispose of it without clearing the entire under-sink area?
Below are thumbnails of the area and the debris. You can click on the images to get a larger view.
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