Quick Answer: When you’re buying an alkaline water machine, focus on the ionization plate count (aim for 7–13 plates), a pH range of 8–11, and an ORP output from -200 to -800 mV. Make sure it has NSF-certified filters and a flow rate that handles your household’s needs. AMPAC USA’s commercial-grade units, for example, use electrode-grade titanium plates with platinum coating, built for lasting performance.