This product change tap water into tasty Alklaine Ion Water with a pH 8. 6. Also it can remove chlorine and smell of chlorine in tap water for a short time. Just soak this stick in a bottle for 90 minutes (500 ml bottle) ~2, 3 hours(2L bottle). It can treat 500ml ×480 bottles or 2L ×120bottles. It is reusable and economical.