Pressurized domestic system: Pressurized systems offer an alternative where soil and topographical conditions do not permit placement of a conventional septic system. This is especially true where the topography requires the drainfeild to be located up-hill from the septic tanks or where there is uneven terrain that would otherwise hinder placement of a conventional system. Wastewater is pumped out by an effluent pump into the drainfeild to the point where the entire field is saturated.
Gravity drain systems: In a gravity system, as wastewater enters the septic tank, it pushes gray water out the other end, through a network of pipes, to the drainfield. This is gravity flow to the drainfield, and no pump is needed.