By vries
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A septic tank usually has around 1,500 gallons of capacity for a three-bedroom house. Care has to be taken when performing water-related chores such as laundry and bath-taking to make sure the septic tank isn't overloaded. When the septic tank gets to a certain level, the waste water enters the leach-lines and "leaches out" or "percolates" through those lines. The lines are sitting on a bed of gravel and are filled with holes which allow the leaching to take place.