Goulds Water Technology, Liberty,Power-Flo & Zoeller submersible stormwater, wastewater & sewage solid handling pumps, grinder pumps, pump & basin ejector systems, quick john toilet basin & grinder pump package. Most sewage systems work by using gravity to move solids and liquids down a line. Sometimes it is not possible to put plumbing devices uphill from a septic or city sewage system. In those cases, a sewage pump is necessary to move the effluent. A sewage pumps job is to move solids and liquids between locations. A typical sewage pump will sit submerged in a sewage basin, located in the lowest area of the location needing drained. Most pumps are capable of handling solids up to 2 inches in diameter. Commercial pumps may be capable of handling even larger solids. The intake for that pump is located as close to the floor of the basin as possible. The goal is to empty as much of the solids and liquids as possible out of the basin. However, it is unlikely that total draining will ever take place without manual intervention. The vast majority of sewage pumps work the same way. A bulb is attached to the sewage pump much the same way it may look on a sump pump or even in a toilet reservoir. When that bulb reaches a certain height, it kicks on a switch, starting the pumping action. When the liquids lower the bulb to a certain point, the pump switches off. The size of the pump should be based on the amount of sewage generally needing to be transported, usually expressed in gallons per hour.