The basement renovation, we often hear the basement drainage to use sewage lifting pumps, and along with this there are often equipment pits, sewage pits and other sub-pits, sometimes the size of the pit is not small, this is in order to place the sewage lifting pumps, so that the pumps are in the lowest position, especially for the old way of draining a pit and two pumps, or stainless steel lifting pumps in the basement drainage of the household, we can actually first of all, exclude these two