Disclosed is a set-up for an oral irrigator, as a system of components and preferably as a single, hand-held device. Herein a provision is made to dispense oral irrigation fluid comprising antimicrobial ions/chemical species produced in situ (in the system or device) by electrolysis of an appropriate salt solution, i.e., an electrochemically activated solution (ECAS). The production of ECAS is enabled by providing an electrolysis chamber. The ECAS output liquid is controlled by means of two different sensors, viz. a hypochlorite sensor and an ORP (oxidation reduction potential) sensor. The sensors allow the determination of undesirable contaminants after ECAS generation, by determining a possible difference in the increase (or decrease) of the values for hypochlorite and ORP.
