SBR stands for "sequential batch reactor." In contrast to the flow-through principle, the system's activation chamber is fed preclarified wastewater at intervals. The result is a purification process in four separate phases.The ZONS^®eco air is a purely biological treatment system. Following preclarification in the settling tank, the remaining crude water is transferred to the activation tank.

Here, aerobic microorganisms (activated sludge) consume impurities, converting them into biomass. The waste water is ventilated in regular intervals Ventilation oft he plant is achieved by microbubble air using membrane diffusers on the bottom oft he tank.. With the help of this oxygen the microorganisms (activated sludge) reduce independently the pollutants and increase. The noiseless air compressor, which supplies the plant, is accommodated thereby in the external switchgear cabinet of the plant.