Why should I buy a constant ORP outlet water ionizer?

How does one sort through this and determine which units are good ones?

Our answer, if after using the unit for one year and the negative charge of ORP is still in the range of about -350mv to -200mv then this unit is performing as you need. However, the water ionizers on the market will increase the negative charge of ORP within a few months. Especially, in the hard water areas where the calcium will build-up the on the electrodes. At that moment, you are drinking the alkaline water only. The ionized water's negative charge of ORP should be in the range of -350mv to -200mv. Then the Ionized Antioxidant in the form of Hydroxyl Ions (an oxygen molecule with an extra electron) donates its extra electrons to free radicals (an oxygen molecule that is missing one electron).

Our AQUA VIVA SP900 utilizes state of the art MICOM Digital Technology that allows complete versatility in preventing overheating, regulating precise constant ORP outlet, self-cleaning and diagnostic mechanisms.