Chemistry
If water smells bad, then that odour can be removed by adding

Alum
Deactivated nitrogen
Bleach
Activated carbon

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Chemistry
The open "Sigrees" or coal stoves often require fanning to sustain burning because of

Interrupted release of moisture from the material
Lack of oxygen in the surroundings of sigrees
Accumulation of smoke and dust over the sigrees
Tendency of carbon dioxide to form a layer along with dust smoke

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