| Contamination | Disease Caused | Watershed RO System | UV Purifier | Boiled Water |
| Sodium | Heart Disease | removes | does not remove | does not remove |
| Calcium | Kidney Stone | removes | does not remove | does not remove |
| Magnesium | Kidney Stone | removes | does not remove | does not remove |
| Lead | Nephralgia, Mental retardation | removes | does not remove | does not remove |
| Copper | Indigestion Indigestion | removes | does not remove | does not remove |
| Mercury | Pain | removes | does not remove | does not remove |
| Nitrate | Dysentry Dysentry | removes | does not remove | does not remove |
| Bacteria | Bacterial Diseases | removes | does not remove | does not remove |
| Pyrogen | Fever | removes | does not remove | does not remove |
| Virus | Viral Diseases | removes | does not remove | does not remove |
| Fluoride | Fluorosis | removes | does not remove | does not remove |
| Arsenic | Poisoning | removes | does not remove | does not remove |
| Iron | Constipation, Dysentry | removes | does not remove | does not remove |
| Insectisides & Pesticides | Cancer | removes | does not remove | does not remove |
| Salinity, brackishness | removes | does not remove | does not remove | |
| Bad taste & Odour | removes | does not remove | does not remove |
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