Common ways to purify drinking water

Before drinking water, we must ensure that it is pure. We all know that Water directly from the water source contains contaminants like bacteria, viruses, pesticides, chemicals, dirt and odor. Drinking such water might risk our lives causing diseases like diarrhea, typhoid, plague, etc., It is essential to purify water before we consume. The most common and easiest ways to purify water are boiling, filtration, reverse osmosis. We’ll discuss in detail about each of the methods mentioned above.


Boiling water is one of the most common and easiest method to purify water where there are no purification machines. While boiling water, it is essential to know how long it is to be boiled to be pure and effective. It should be boiled for atleast 3-5 minutes inorder to remove microscopic pathogens. And before boiling water, if you find any cloudy formation in the water then you should filter the water with coffee filters or use paper clothes as a filter. This will remove the dirt and debris in the water and makes it clear.

Water Filtration

Water filtration is one of the oldest and simplest method to purify water. In this method, water is allowed to pass through the filter to remove impurities like dirt, dust and debris. Water is filtered many times to ensure that it is free from impurities. The filter consists of  porous materials like cotton or glass wool, cloth, paper, gravel or sand.

In home, we can filter the water with cloth or coffee filters. These filters are used in municipal water treatments in olden days. Nowadays they are using multimedia filters which is made of carbon. In addition to this, the water also undergoes physical and chemical processes to remain pure. Finally, the water is properly purified and emerges from the multimedia filter which is free from dirt, debris and contaminants.

Reverse Osmosis

Reverse osmosis is the water purification method wherein water is permitted to pass through a semi-permeable membrane. This membrane removes large particles, contaminations, dirt, odour, salt and chlorine from the water. First step is pre-filtration done using sediment and carbon filter. It removes large sediments and chlorine from the water. Then water is forced under pressure to pass through semi-permeable membrane. It eliminates calcium, bacteria, virus, sodium. Finally, water is again filtered using carbon or post filter to wipe off the contaminants that has been escaped from the membrane. This is the innocuous way to get pure water.

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