An apparatus for the production of oxidizing biocides is disclosed. The apparatus has a first feed line (10) for transporting a concentrated chlorine, a second feed line (12) for transporting a concentrated amine, a third feed line (14) for transporting water as a reaction means, an agitator (16), and a product outlet (17). The first feed line and the second feed line feed into the third feed line, mixing the concentrated chlorine and the concentrated amine without dilution. The third feed line feeds into the agitator. The apparatus can be used as a remote production system where the product is stored use or it can be an in situ production system where the product can be in fluid connection with the system being treated. The preferred product of the system is chloramine, which can be produced in a stable form with this apparatus.
