Fresh ionized water straight from an ionizer machine at your sink is the healthiest drinking water. However, when you are away from home or traveling, the AlkaTraveler Stick is your second best choice.The AlkaTraveler Stick (ATS) is designed for those who travel a lot or have a need to take their ionized water on day trips or weekend trips. After you make your ionized water at home, the electrical charge starts to decline as hours go by. You can simply drop the ATS in your ionized water to recharge it to full potency. It only takes a few minutes!Made of all natural ceramic coated minerals in a surgical stainless steel housing, the ATS can also convert any bottled water to mildly ionized alkaline water within minutes. The AlkaTraveler Stick is not a filter. Though it does remove a small amount of chlorine, the ATS is better suited for pre-filtered or bottled water.The ATS is the ONLY product in its category to pass the NSF safety tests in the U.S.A. and is safe for long term use.