Demineralized water vs distilled water
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demineralized water vs distilled water differences uses
Here is a thorough comparison:
Demineralized Water vs. Distilled Water
How They Are Made
| Demineralized Water | Distilled Water | |
|---|---|---|
| Process | Ion exchange resins, reverse osmosis, or electrodialysis | Boiling + condensation (collecting steam) |
| What it targets | Dissolved ionic minerals (salts) | Minerals, most bacteria, viruses, many chemicals |
| Residual impurities | May retain organic compounds, bacteria, viruses (non-ionic) | May retain volatile organic compounds (VOCs) that evaporate with steam |
Purity Level
- Distilled water is generally considered purer. The boiling process kills microorganisms and removes a wide range of contaminants beyond just ions.
- Demineralized water removes mineral ions very effectively but is not sterile - bacteria, viruses, and some organics can remain if pre-filtration or additional treatment isn't applied.
- In practice, the purity of each depends heavily on source water quality and whether pre-treatment (like carbon filtration) is used.
Key Differences at a Glance
| Feature | Demineralized | Distilled |
|---|---|---|
| Mineral ions removed | Yes (primary goal) | Yes |
| Bacteria/viruses removed | Not reliably | Yes |
| Volatile organics removed | Not reliably | Not reliably (they evaporate too) |
| Production cost | Lower, more scalable | Higher energy cost |
| Production scale | Industrial-scale easily | Slower, less scalable |
| Typical resistivity | Up to ~18 MΩ·cm (with mixed-bed DI) | Lower than DI in most setups |
Common Uses
Demineralized water is preferred for:
- Industrial boilers and cooling towers (scale prevention)
- Electroplating and metal finishing
- Chemical manufacturing
- Car batteries and radiators
- Aquariums (when minerals are then dosed precisely)
Distilled water is preferred for:
- Medical and pharmaceutical applications (IV fluids, autoclaves)
- Laboratory reagent preparation and chemical analysis
- CPAP machines and humidifiers
- Steam irons
- Drinking water (when purity from pathogens is the concern)
- Baby formula preparation
Can You Drink Them?
- Distilled water is safe to drink, though the lack of minerals gives it a flat taste. Long-term exclusive consumption without a balanced diet is not ideal since it provides no minerals, but it is not harmful.
- Demineralized water is generally not recommended for drinking because it may still contain organic contaminants, bacteria, or viruses. Industrial-grade demineralized water is not produced with drinking safety in mind.
Summary
The main practical difference: distilled water removes a broader range of impurities (including pathogens) because heat is the mechanism, while demineralized water is a cost-effective industrial solution that specifically targets mineral ions. For the highest purity in laboratory or medical use, distilled (or double-distilled) water is the standard. For large-scale industrial processes where mineral removal is the only goal, demineralization is more economical.
If someone drank demineralized water?
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drinking demineralized water health effects risks WHO
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demineralized water consumption health effects
Here is a complete breakdown of what happens when someone drinks demineralized water:
What Happens If You Drink Demineralized Water?
A Single Glass - Not a Crisis
Drinking demineralized water once or occasionally will not hurt you. Your body has strong homeostatic mechanisms that buffer short-term mineral fluctuations. You won't notice any immediate effect.
Short-Term Physiological Effects (Regular Consumption)
The WHO's review on this topic (Kozisek, 2005) identified several mechanisms that kick in even with short-term use:
- Increased diuresis (urination) - Low-mineral water increases urine output by ~20% on average, because the body tries to equalize osmotic pressure.
- Electrolyte loss - The kidneys excrete more sodium, potassium, chloride, calcium, and magnesium to compensate for the low-mineral load coming in.
- Serum sodium rises, serum potassium drops - Shifts in electrolyte balance affect nerve and muscle function.
- The "hungry water" effect - Water with very low total dissolved solids (TDS) draws minerals out of the gut lining and food during digestion, meaning you absorb less nutrition from what you eat.
Long-Term Risks (Exclusive or Heavy Use)
| Risk | Mechanism |
|---|---|
| Bone and tooth demineralization | Chronic low calcium and magnesium intake + increased urinary excretion leads to reduced bone mineral density. A 2023 review in Cureus (PMID 38125211) confirmed this link. |
| Cardiovascular risk | Magnesium deficiency is associated with higher cardiovascular disease risk. Over 80 epidemiological studies reviewed by WHO found a correlation between soft/low-mineral water and cardiovascular mortality. |
| Hyponatremia risk | Drinking large volumes of low-mineral water can dilute blood sodium, causing headaches, confusion, nausea, or in severe cases seizures (rare, but a real risk in athletes or heavy drinkers). |
| Metabolic disruption | Studies in animal models showed decreased thyroid hormone (T3) and aldosterone secretion, increased cortisol, and kidney changes (glomerular atrophy) after long-term demineralized water consumption. |
| Elevated homocysteine in children | A 2023 study (PMID 36969809) found very low-mineral water consumption may raise homocysteine levels in children, a known cardiovascular risk marker. |
| Possible microbial contamination | Unlike distilled water, demineralized water is not sterile, so bacterial regrowth is possible depending on how it was stored and produced. |
WHO Position
The WHO explicitly does not recommend demineralized or very low-TDS water for drinking. Their guidelines suggest drinking water should have a minimum TDS of around 100 mg/L and contain adequate calcium and magnesium. Below 100 mg/L TDS, the physiological risks outlined above become meaningful.
Bottom Line
| Scenario | Risk Level |
|---|---|
| One glass, occasionally | Negligible |
| Drinking it daily for weeks | Mild - electrolyte imbalance, increased mineral loss |
| Exclusive source of drinking water long-term | Real risk - bone loss, cardiovascular effects, possible hyponatremia |
| Children or pregnant women long-term | Higher concern - fetal skeletal development affected in animal studies |
The body gets minerals from food too, so if your diet is rich in calcium, magnesium, and other electrolytes, the risk is reduced. But demineralized water is simply not designed for human consumption, and the WHO and most public health bodies advise against using it as a regular drinking water source.
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