Septic tank equipped with a device for marking the separation between two fluid environments

摘要

The tank has a discharge pipe (4) with an outer section (14), disposed at a preset level in an enclosure, for entry of water. The section is provided with a grid permitting the passage of water while retaining large particles to prevent the particles from penetrating the pipe. A tracking device (17) is associated with the pipe and includes an optical emission unit (24) and an optical reception unit (25) e.g. photodetector. The units are disposed at a predetermined level lower than a predetermined level of the section and correspond to an alert level of fluid level of the bottom of the tank.