Methods and systems of measuring biofilms and/or biofilm streamers are presented. The system has at least one channel, a biofilm streamer promotion element, a fluid capable of moving along the channel, wherein the fluid has a flow driven by a controlled pressure; and a measuring element capable of measuring a flow rate of the fluid through the channel. Additionally, methods of screening for compound(s) that promote and/or inhibit biofilm and/or biofilm streamers using this system are also presented. Uses of the system, methods and identified compounds are presented for medical and/or industrial environments.