NOVELTY - A system to form different bacterial floras that serves as decontamination treatment of residual waters, using earthworm's humus, as detonator of bacterial flora located in celluloid support material in first layer for stucking bacterial growth, inert material such as stones or plastic on second layer of system that supports degradation of organic material and other inert material on third layer connected to surface by vertical tubes through different layers and horizontal tubes that are connected to exterior through walls of system.    USE - The system is useful for forming different bacterial floras that serves as a decontamination treatment of residual waters, waste water or other waste liquids including semi-liquids (claimed).    ADVANTAGE - The system is cheap, triggered for different liquid or semi liquid wastes, does not produce unstable muds, produces a subproduct that can be used as natural fertilizer, and sensitive to organic charge or liquid industrial residues variations in the served water.    DETAILED DESCRIPTION - A system to form different bacterial floras that serves as a decontamination treatment of residual waters, using earthworm's humus of any species of earthworm, as a detonator of the different bacterial flora that may form depending on the type of residual water that is pretended to decontaminate, which is located in a celluloid support material in the first layer of the system as a support means for stucking bacterial growth, inert material on the second layer of the system that can be stones or plastic, that may permit the formation of a bacterial flora that supports the degradation of the organic material and finally, on the inferior part other inert material that allows to form an air chamber over the system floor, for which it is connected to the surface by vertical tubes through the different layers and horizontal tubes that are connected to the exterior through walls of the system. The layer can be made with prefabricated concrete material, stones of different sizes or plastic, that allows an aerobic material and a fast drainage of the water to the exterior of the system. An INDEPENDENT CLAIM is included for an apparatus for treating waste water or other waste liquids (including semi-liquids).