An automated modular filtration system for low volume tangential flow filtration processes for the development of biological products, the filtration system comprising a plurality of filtration modules formed as separate assemblies, each filtration module containing at least one individual filtration unit, each filtration unit being designed for executing a filtration process independent of the other filtration units of the filtration system, each filtration module including first input ports configured to receive a first type of fluids, the fluids of the first type being process fluids which are specific to the respective filtration processes executed in the individual filtration units and including a protein solution and/or a buffer solution, each filtration module including second input ports configured to receive a second type of fluids, the fluids of the second type being system fluids which are not specific to the respective filtration processes executed in the individual filtration units, the second input ports being connected to system fluid reservoirs including at least one of the following: a fluid reservoir containing a cleaning fluid, especially NaOH, a fluid reservoir containing a buffer solution for calibration, a fluid reservoir containing water, a fluid reservoir containing a storage solution being used to maintain the physical and chemical integrity of the system during periods of non-use, each filtration module including exit ports outputting unused system fluids, the second input and exit ports being designed for establishing inter-module connections so that the system fluids can be forwarded from one filtration module to an adjacent filtration module of the filtration system, the modular filtration system further comprising at least one control unit designed for jointly controlling the filtration processes executed in the individual filtration units. a plurality of filtration modules formed as separate assemblies, each filtration module containing at least one individual filtration unit, each filtration unit being designed for executing a filtration process independent of the other filtration units of the filtration system, each filtration module including first input ports configured to receive a first type of fluids, the fluids of the first type being process fluids which are specific to the respective filtration processes executed in the individual filtration units and including a protein solution and/or a buffer solution, each filtration module including second input ports configured to receive a second type of fluids, the fluids of the second type being system fluids which are not specific to the respective filtration processes executed in the individual filtration units, the second input ports being connected to system fluid reservoirs including at least one of the following: a fluid reservoir containing a cleaning fluid, especially NaOH, a fluid reservoir containing a buffer solution for calibration, a fluid reservoir containing water, a fluid reservoir containing a storage solution being used to maintain the physical and chemical integrity of the system during periods of non-use, each filtration module including exit ports outputting unused system fluids, the second input and exit ports being designed for establishing inter-module connections so that the system fluids can be forwarded from one filtration module to an adjacent filtration module of the filtration system, each filtration module containing at least one individual filtration unit, each filtration unit being designed for executing a filtration process independent of the other filtration units of the filtration system, each filtration module including first input ports configured to receive a first type of fluids, the fluids of the first type being process fluids which are specific to the respective filtration processes executed in the individual filtration units and including a protein solution and/or a buffer solution, each filtration module including second input ports configured to receive a second type of fluids, the fluids of the second type being system fluids which are not specific to the respective filtration processes executed in the individual filtration units, the second input ports being connected to system fluid reservoirs including at least one of the following: a fluid reservoir containing a cleaning fluid, especially NaOH, a fluid reservoir containing a buffer solution for calibration, a fluid reservoir containing water, a fluid reservoir containing a storage solution being used to maintain the physical and chemical integrity of the system during periods of non-use, each filtration module including exit ports outputting unused system fluids, the second input and exit ports being designed for establishing inter-module connections so that the system fluids can be forwarded from one filtration module to an adjacent filtration module of the filtration system, the modular filtration system further comprising at least one control unit designed for jointly controlling the filtration processes executed in the individual filtration units.