Mineral classification (TDS)

Not all waters are the same. The distinction between spring water and mineral water lies in mineral content at the source.

Mineral water classification requires a minimum of 250 mg/L of Total Dissolved Solids (TDS). Waters below this level are typically categorised as spring or low-minerality waters.

TDS represents the total concentration of dissolved inorganic substances - primarily bicarbonates, sodium, chlorides, sulphates, calcium, magnesium and trace elements. These naturally occurring minerals define a water’s structure, depth and character.

Pure One contains 780 mg/L, placing us within the medium mineral water category - a level rarely found in New Zealand, where most bottled waters have significantly lower TDS profiles. Medium mineral waters such as ours offer balance and presence - a refined mineral profile that is noticeable with every sip.

  • Super low minerality: 0 - 50 mg/L

  • Low minerality: 50 - 250 mg/L

  • Medium minerality: 250 - 800 mg/L

  • High minerality: 800 - 1,500 mg/L

  • Very high minerality: >1,500 mg/L

  • Pure One – 780 mg/L (medium mineral water)

Sodium-bicarbonate mineral water

Mineral waters are classified according to their dominant dissolved minerals. Categories include bicarbonate, sulphate, chloride, calcic, magnesiac, fluorurate, ferrous and sodium-rich waters.

Pure One is classified as a Sodium–Bicarbonate Mineral Water, as its primary dissolved minerals are sodium and bicarbonate. This classification reflects the geological origin of the aquifer and defines the water’s structure and stability at source.

Clinical research has explored the influence of bicarbonate-rich mineral waters on acid–base balance and digestive parameters. Historically, sodium–bicarbonate waters have been valued for their distinctive mineral composition and structured profile.

As with all sodium-containing mineral waters, consumption may not be suitable for individuals requiring restricted sodium intake.

Source protection

Nitrate levels are widely recognised as an indicator of source protection. Elevated nitrate concentrations are commonly associated with surface contamination from agricultural runoff, fertilisers or human activity.

Pure One measures <0.2 mg/L nitrate at source, reflecting the depth, geological protection and isolation of its artesian aquifer. The water rises naturally through a 1,000-metre sealed well, further protecting it from surface exposure.

In New Zealand, the Maximum Acceptable Value (MAV) for drinking water is 11.3 mg/L as nitrate-nitrogen (NO₃-N). Pure One’s exceptionally low level underscores the integrity of its natural origin.

Alkaline (pH)

pH (potential hydrogen) measures the acidity or alkalinity of water, and its level plays a key role in hydration. Unlike commercially altered alkaline waters, Pure One’s pH is not artificially adjusted. Its stability is the result of prolonged geological interaction and naturally occurring mineral balance.

A third-party analysis conducted in 1998 recorded a pH of 8.8, demonstrating long-term stability at source. The water’s alkalinity remains consistent due to its natural structure and composition.

  • Acidic: pH 1 - 0.69

  • Neutral: pH 7

  • Alkaline: pH 7.1 - 14

"Water that is more alkaline, with a pH of 7.4 or higher, can move more readily across the aquaporin channel. The value of higher pH water largely has to do with accelerated absorption…water that has a higher pH, provided that pH isn't too high, is going to be absorbed more quickly. 

There is also growing evidence that it can adjust the function of certain cells within your immune system and thereby reduce certain inflammatory responses."

- Andrew Huberman, PhD. Professor of Neurobiology & Ophthalmology, Stanford Medicine

Pure One’s mineral composition is the result of time, depth, and geological protection. Untouched for at least 46,000 years, its structure reflects a rare balance found naturally at the source.

No additions. Simply mineral water, as it occurs in nature.

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Disclaimer: Information provided is for general educational purposes only and is not intended as medical advice.