Individual sewage system and installing a septic tank

Not having a public sewerage system in the area to connect to; those who built houses in these areas were forced to provide an individual sewage system by purchasing and installing a septic tank. it is a container that we bury in the ground; and that the domestic water produced by the house and its dependencies be discharged inside. the pit can be built with different materials: concrete; fiberglass; polyethylene: each user can freely choose their preferred model and its dimensions according to their needs.