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A 3,000-Year Legacy, Filtered Through 8,000 Years of Nature
Drawn from the sacred underground spring of Rogaška Slatina — a healing site revered for more than 3,000 years — ROI is one of the rarest and most mineral-rich waters in the world. Naturally carbonated, exceptionally pure, and shaped by an 8,000-year geological journey through magnesium-dense rock, it carries a mineral complexity no modern process could ever replicate. Celebrated for its unparalleled magnesium content and ancient origin, ROI is not simply hydration — it is a mineral elixir honored by those who understand its depth.
Bottled at the source, ROI reveals a bold, mineral-forward profile with naturally occurring effervescence and a distinctive, almost saline character. Sommeliers, chefs, and wellness connoisseurs seek it out for its digestive support, revitalizing properties, and its rare ability to stand beside elevated cuisine with confidence and beauty.
Why We Love It
According to legend, the spring of Rogaška Slatina was revealed when Pegasus struck the earth with his hooves, opening what would become one of Europe’s most storied wellness sites. Today, ROI rises untouched, effervescent, and rich with a remarkable Total Dissolved Solids level of 7,481 mg/L — one of the highest of any natural mineral water. This rare mineral density gives ROI its unmistakable structure and profoundly restorative nature.
Filtered through 8 millennia of natural geology and bottled with no additives or artificial carbonation, ROI’s smooth texture and mineral-forward signature have made it the preferred pour for Michelin-starred chefs, elite athletes, and world-renowned water sommeliers.
Mineral Composition & Key Natural Benefits
Magnesium (1,300 mg/L): Supports muscle recovery, electrolyte balance, and a sense of calm.
Calcium (610 mg/L): Essential for bone strength, cellular vitality, and nerve signaling.
Bicarbonate (7,700 mg/L): Helps regulate the body’s pH and encourages optimal digestion.
ROI isn’t just water — it is liquid ceremony. Ideal for mindful rituals, wellness-focused menus, restorative dining, and refined settings where ordinary still or sparkling waters simply fall short.
Rienne is an official U.S. distributor of ROI Water, ensuring authenticity, optimal quality, and direct access to this rare, mineral-rich natural water.
Our curated expressions are crafted to be experienced with intention. Unlike traditional spirits, their compositions are not designed around alcohol’s structure, and therefore do not follow the same ratios or profiles. Their character reveals itself through mindful preparation — in recipes, pairings, and small rituals that allow aroma, texture, and nuance to unfold.
For inspired serves, we invite you to explore The Pour, a space devoted to elevating the way each expression is enjoyed.
Should you wish for a more personal approach, our Concierge Team is always at your service at corcierge@rienne.co.
