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Independent, evidence-based water education · Reviewed for 2026

Types of Water · Tool

Water Comparison Tool

Pick any two water types and compare them side by side on minerals, taste, cost, best uses and one honest caveat — clear, balanced and evidence-based.

4.7 (149) Free & private — runs in your browser

Descriptions reflect typical values across common sources. Actual mineral content, cost and taste vary widely between regions and brands. This is an educational overview, not a definitive product comparison.

Educational estimates only — not medical, engineering or professional advice.

Water is often talked about as if it is all the same, but tap water, mineral water, spring water, distilled, reverse osmosis and alkaline water differ substantially in composition, taste, cost and practical use.

This tool lets you compare any two types side by side in plain language. There are no hidden rankings or judgements — just the facts that matter most when choosing between them.

How to use this tool

Choose one water type from each dropdown and the comparison table updates instantly. The table covers five key aspects:

  • Typical minerals / TDS — what is dissolved in the water and roughly how much.
  • Taste — what most people notice when drinking it, and what varies.
  • Typical cost — a broad guide to relative expense per litre.
  • Best used for — the situations where this type genuinely shines.
  • One caveat — an honest limitation or trade-off worth knowing.

For more detail on any individual water type, explore the linked guides in the related resources below.

A little background

The descriptions in this tool reflect typical characteristics across common sources and regulated markets. Real-world values vary: tap water quality differs significantly between regions, mineral waters vary by spring, and bottled water labelling rules differ between countries.

Costs are illustrative and based on typical UK/EU retail and utility pricing. Environmental considerations — plastic waste, transport energy, water-treatment carbon footprint — are not captured in the cost figures but matter when making a long-term choice.

Tool FAQ

In countries with regulated water supplies, tap water is subject to rigorous legal quality standards and routine testing. In many cases it meets or exceeds the standards applied to bottled water. The choice between them for drinking is often one of taste preference and convenience rather than safety.

This concern is sometimes raised but is not supported by robust evidence in the context of a normal diet. The body regulates mineral balance through diet primarily, and the small amounts gained or lost from drinking water are minor in comparison. That said, using distilled water as your sole long-term drinking source without dietary mineral intake is not ideal practice.

Naturally alkaline water gets its higher pH from dissolved carbonates and bicarbonates in the geology it passes through. Ionised alkaline water is produced by electrolysis, which separates water into alkaline and acidic streams. The two routes produce chemically similar water at the pH level, though the mineral composition differs.

Not necessarily. In the EU and UK, "natural mineral water" has legally defined requirements: the source must be verified, the composition must be stable, and the water must be bottled at source without treatment beyond limited filtration and carbonation. "Spring water" regulations are less strict in most jurisdictions and do not require compositional stability.

Without a remineralisation stage, RO water can taste flat or slightly empty because very few dissolved minerals remain. Many modern under-sink RO systems include a post-filter that adds back small amounts of calcium and magnesium, which noticeably improves the taste and mouthfeel.
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