Hydrogen water vs RO water: how people compare hydration formats

People compare hydrogen water and RO water because both appear in hydration-focused wellness discussions, not because they do the same thing. The lists below describe how each is usually characterised.

• Hydrogen water: explored for antioxidant immersion
• Hydrogen water: prepared fresh before drinking
• Hydrogen water: source water can be filtered, mineral or RO
• RO water: explored for low dissolved solids
• RO water: installed under a sink or on a bench
• RO water: often paired with a remineralisation stage

RO water is defined by what has been taken out: a semi-permeable membrane removes most dissolved solids, so the finished water is low in minerals. Hydrogen water is defined by what has been dissolved in: molecular hydrogen gas, which leaves nothing behind once it dissipates. Because the two act on different variables, RO water is a common source water for a hydrogen system.

RO water is typically described as flat or neutral because most dissolved solids have been removed. Hydrogen water tastes exactly like the water it was made from, so hydrogenated RO water tastes like RO water.

RO systems are plumbed in and maintained on a cartridge schedule. Hydrogen water systems are used at the moment of drinking and maintained on a cell or filter schedule. Households that own both usually run RO as the household water and use the hydrogen system for specific glasses.

Hydrogen water is often compared with electrolytes, hydrogen tablets and hydrogen inhalation. RO water is often compared with distilled water, filtered water and mineral water.