Not having in the area a public sewerage system to be connected to; those who built homes in these areas were forced to provide an individual sewerage system by purchasing and installing a septic tank. it is about a container that we buried in the ground; and that inside it will be discharged the domestic water produced by the house and its dependencies. the pit can be constructed of different materials - concrete; glass fiber; polyethylene - each user being free to choose their preferred model and its dimensions according to needs.