The invention relates to a pipeline system for transporting a biocide solution from a reactor device (1) for generating biocide solution to a treatment device (5) for introducing the biocide solution into a ballast water flow in a ballast water line (92, 94) having a transport line system (11, 42, 54) between the reactor device (1) and the treatment device (5) of the ballast water treatment system. The invention is characterized by a pressurized water line system (8, 44) connecting a pressurized water source (2) to the transport line system (11, 42, 54) at the connection thereof to the reactor device (1), and by a flush water line system (9, 30, 40) connected to the transport line system (11, 42, 54) at the connection thereof to the treatment device (5).