A device and method for increasing the number and type of ions in a hydrotherapy treatment to assist in removing unwanted chemicals from the body. A battery-powered array is submerged into a liquid foot bath to generate ions through electrolysis. The array has at least two electrodes, one containing copper and/or zinc, the other steel. The device can be run in two modes, thereby creating different types of ions and enabling the removal of different types of chemicals. The device uses a current and voltage regulator to deliver a regulated amount of current into the array regardless of the conductivity of the liquid, and electrical circuitry is used to control the duration and mode of the treatment. Excessive heat is dissipated with a heat sink.