Start out drinking a lower level strength at level one, drinking 1-3 glasses per day. If the ionized water agrees with you, increase the amount you drink and the level of Ionization intensity. The stronger, the better up to level 9.5 pH, but take your time in building up to the higher levels. The antioxidant is most powerful on the high levels. Some find that they experience more energy at the higher levels, but the fresher the Ionized Water is, the stronger these properties are.