The ground water has been heavily contaminated by means of various factors especially if the borewell is near to any agricultural or industrial areas as there will be a lot of pesticides, fertilizers and other chemicals that seep through the ground and reaches the underground water.
Hence, it’s not safe to drink the borewell water without filtration. The purification of the water depends on the type and amount of the contaminants. These contaminants can be identified with the help of several test report.
If there are no major contaminants, then an RO water purifier is sufficient to purify water. If there is arsenic or any other harmful metals in the water, it can be removed by oxidation with chlorine (Sodium Hypochlorite) or potassium permanganate or coagulation with ferric chloride and then filtering it
Borewell water can be filtered by adding alum (Aluminium Sulphate) solution directly into the well or to the primary tank to which the bore water is pumped to. Sometimes the water from the bore stinks and smells like rotten eggs which is due to the Hydrogen Sulphide gas produced by sulfur bacteria. This problem can be removed by adding enough aeration to the well which is a good option for low concentrations of hydrogen sulfide in well water since the Oxygen in air reacts with hydrogen sulphide to convert it into an odorless Sulfate.
To efficiently remove excess TDS, chemicals, as well as pathogens present in the water, making it absolutely healthy for everyday consumption, many prefer the combination of RO and UV water purifier.
Through these ways the contaminated water can be treated and purified at home