One of our neighbors recently expereienced a back-up issue at his garbage disposal. In investigating the cause of the problem, he asked me to post a message advising others to be careful about what we put down the disposal. For instance, coffee grinds, egg shells and starchy foods can eventaully lead to a problem. And, most importantly, do not put grease/lard/shortening products down into the system. Instead, keep a container with a lid into which you can pour the used product and then put it in the trash.