NOVELTY - A conditioning system has a bioreactor divided into sub-compartments through which growing culture flows, where the conditioning system includes reservoirs for microorganisms and nutrients, a metering pump controlled by a timer to transfer microorganisms and nutrients from reservoirs to a sub-compartment, a water supply unit, an air pump, an electrical control device, and an outfall mechanism.    USE - The inventive system is used for on-site growth and conditioning of microorganisms for use in water body restoration including wastewater treatment plant, sewers and drains, and grease traps. The system may be used for industrial wastewater treatment, aquaculture, agriculture, lake restoration, garden ponds, and for producing active cultures for retail sale for aquaria and garden ponds.    ADVANTAGE - The inventive system automatically performs the following operations by maintaining optimal growing conditions in terms of temperature and oxygen concentration: stabilizing cultures out of dormancy and growing cultures to increase their number.    DETAILED DESCRIPTION - A fully automated conditioning system consists of reservoir(s) (27, 28), bioreactor system (29), metering pump (33), water supply unit, air pump, electrical control device (59), and outfall mechanism. The reservoir contains microorganisms to be grown and nutrients for such growth and conditioning. The bioreactor system has compartments partitioned by internal division(s) or dividing structure(s) into at least two sub-compartments including a first sub-compartment in which microorganisms are brought out of dormancy in a culture containing the nutrients and water and then allowed to start growing, and a second and optionally further sub-compartments in which the culture of first sub-compartment flow and stay during appropriate retention time for cell growth. The metering pump is controlled by a timer (35) to transfer a given amount of microorganisms and nutrients from the reservoir to the first sub-compartment. The water supply unit supplies water to the first sub-compartment. The air pump supplies air to all sub-compartments. The electrical control device is connected to the pump, timer and heater for synchronizing their operation. The outfall mechanism supplies the culture containing the grown microorganisms from the second sub-compartment to the water body to be restored.    DESCRIPTION OF DRAWING(S) - The figure is a front elevational view of the inventive conditioning system.    Cabinet (23)    Reservoirs (27, 28)    Bioreactor system (29)    Metering pump (33)    Timer (35)    Low level float switch (37)    Additional pump (51)    Electrical control device (59)