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WebA gravity system requires at least 3 feet of native suitable soil beneath the drainfield. How a Gravity System Works As wastewater flows from the house into the septic tank through the inlet baffle, heavy solids settle to form a sludge layer on the bottom of the tank. WebJun 18, 2024 · Aeration replenishes the oxygen. Bubbling oxygen through the water also keeps the organic material suspended while it forces 'grit' (coffee grounds, sand and other small, dense particles) to settle out. Grit is pumped out of the tanks and taken to landfills. 4. Removing sludge Wastewater then enters the second section or sedimentation tanks. WebApr 13, 2024 · Gravity is the force that keeps us grounded. NASA used a Lunar Landing Walking Simulator to study astronauts' ability to perform tasks whilst experiencing one … feeding birds bread good or bad