In standard septic systems, gravity is used to flow the sewage from the home to the septic tank, and then to the leach field. There are times, however, when the sewage needs to be pumped because the tank or leach field is at higher ground. Occasionally, septic pumps are also used to pump sewage into the city sewer, when the street sewer line is higher than the home sewage line. Septic Lift Stations fill with sewage to a certain level, then the pump turns on and the sewage is pumped on to the next stage.
Inside the station, where the sewage collects, there is a float. This float acts as a switch. When the tank fills, the switch triggers, and turns on the pump. If this switch or the pump fails, there is an alarm that will alert the homeowner to the trouble. If the alarm goes off, the plumber should be immediately called.
With smaller lots and more reliable pump technology, lift stations are becoming more popular. With smaller lots, often several units share a leach field. Some of the units will be at a lower elevation, necessitating pumping. Sometimes these smaller lots are near a sewer line, but need to pump it up into the line; a lift station is used for that, as well.
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