Sump pumps help stop flooding in your property. Essentially, the pumps will transport sewage or storm water to where it could easily flow to city pipes. Without sump pumps, you could get an overflow of waste in one area, resulting in major issues.
Some sump pumps are equipped with chopper blades that grind objects into small pieces so that they could flow through the drain system. Sump pumps are intended for both residential and commercial use, but more often used in commerical uses.