ROI Water Analysis:
| Balance | Light |
| Virginality | Superior |
| Minerality | Very High |
| Orientation | Neutral |
| Hardness | Very Hard |
| Vintage | 3,400 Years |
| Carbonation | Natural |
| TDS | 7,481 mg/l |
| ph factor | 6.8 |
| Hardness | 6,725 mg/l |
| Nitrate | < 1 mg/l |
| Calcium | 610 mg/l |
| Magnesium | 1,300 mg/l |
| Sodium | 1,600 mg/l |
| Potassium | 24 mg/l |
| Silica | 86 mg/l |
| Bicarbonate | 7,700 mg/l |
| Sulfate | 2,100 mg/l |
| Chloride | 83 mg/l |
| Source: | Spring |
| Location: |  |
| Country of Origin: | Slovenia |
| Region: | Lower Styria |
| Place: | Rogaška Slatina |
| Established: | 2011 (1647) |
| Company: | ROI Rogaška d.o.o. |
| Status: | Non-member |
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The source is situated in the middle of unspoiled nature, in Rogaška Slatina and according to the legend, ROI's spring was created by the Greek mythological winged horse Pegasus. Legend has it that Pegasus, instructed by Apollo, struck his hoof to the earth at Rogaška and opened up the Roitschocrene spring and Apollo said: “Hereby lies the source of health and the true power of the gods. Instead of Hippocrene, drink Roitschocrene from the spring in front of you.” What sprung forth was one of the world's most magnesium-rich mineral waters.
The springs is situated in the middle of the most tectonically diverse areas in the world, featuring three regional faults Alps, Dinaric Alps, Pannonia Basin and the oldest rock layer is probably about 285 million years old. Radio carbon dating puts the age of Rogaška ROI water at about 8,000 years and the naturally carbonated water rises to the surface without the aid of pumps, as it is driven by the carbon dioxide present within it.
ROI was founded in 1647 and took inspiration from the water's unique, centuries-old history and the legend of Pegasus. Reinterpreting its classical bottle and naming it in a contemporary manner.