Total Dissolved Solids (TDS)
Total dissolved solids (TDS) indicate the amount of dissolved minerals and other “soluble matter” contained in one litre of water. In Australasia, only natural water with a TDS of over 250 mg/L (250 parts per million (ppm)) can be called a "mineral" water. Water with a TDS of less than 250 mg/L is usually labelled as natural spring water. European standards require a mineral content above 500 mg/L for mineral water; below 500 mg/L is considered spring water.
Note: Only water sourced from an underground, water-bearing strata (as defined in the Australia New Zealand Food Standards Code), with natural minerals, may be labelled as a natural mineral or spring water. No minerals may be added to the water.
