Reverse osmosis purified. Calorie & sodium free. Since 1949. 100% purified sparkling water. The essence of Syfo's Original Seltzer is the purity of its water and it's high effervescence. Scan the QR code with your smartphone for further information. Comments are welcome. Call toll free: 1-888-426-SYFO www.Syfobeverages.com. Please recycle. Made in USA.