Soft Water vs Hard Water
Hardness is the measure of calcium and magnesium dissolved in water. Soft waters feel light and clean; hard waters taste richer and mineral-forward.
What makes water soft?
Soft water contains low levels of calcium and magnesium — typically under 60 mg/L combined as calcium carbonate equivalent. Distilled, reverse-osmosis purified, and glacial waters trend soft.
What makes water hard?
Hard water has high dissolved calcium and magnesium, often picked up from limestone aquifers. Gerolsteiner, Contrex, and San Pellegrino all read very hard.
Mineral comparison
Soft: Acqua Panna, VOSS, Smartwater, Aquafina, Icelandic Glacial. Moderate: Evian, Fiji, Poland Spring. Hard: San Pellegrino, Perrier. Very hard: Gerolsteiner, Contrex.
Taste differences
Soft water tastes light and almost neutral. Hard water tastes heavier and rounder, with a slight mineral or earthy note that some palates prefer with food.
Best uses
Soft water is ideal for tea, specialty coffee, espresso machines, and infant feeding. Hard water suits diners pairing waters with food, mineral replenishment after sport, or anyone seeking dietary calcium and magnesium.
Frequently asked questions
Is soft or hard water healthier?
Neither is unhealthy. Hard water contributes useful calcium and magnesium; soft water is gentler on plumbing and appliances. Pick based on taste and use case.
Is bottled water always soft?
No — bottled mineral waters like Gerolsteiner, Contrex, and San Pellegrino are among the hardest waters you can buy.
Which bottled water is hardest?
Gerolsteiner and Contrex are typically the hardest mainstream mineral waters, with very high calcium and magnesium.
