Sewer ejector pumps will generally provide a higher pumping capacity and the ability to pump up to 2 inch solids whereas most sump pumps max out at about 5000-6000GPH and MAY only handle small solids up to 1/2 of an inch. Please keep in mind however, that your sewage ejector pumps also require a 2 inch discharge pipe to be installed to achieve the above stated specs. Use of a sewage ejector pump in a sump application is fairly common for high pumping capacity applications as long as the discharge is installed correctly. You do NOT want to use a sump pump in a sewage application however!!