Only 8% of India uses water purifiers.
Total Dissolved Solids (TDS) refers to minerals, salts, metals, etc., dissolved in water. It is measured in ppm (parts per million).
• Hardness is a measure of dissolved calcium and magnesium in the water, while TDS is the measure of all dissolved solids.
• Hence, hardness is a part of TDS, and so, the more the hardness of water, the more the TDS will be.
It is the excessive presence of metals like lead, cadmium, chromium, mercury, arsenic, etc., in water.