Role of TDS in Measuring Water Purity

Is TDS the real measure of water purity?

No, TDS is not the only or necessarily the best indicator of water purity. As TDS measures the total concentration of dissolved substances in water, including minerals, salts, metals, and ions, it doesn't distinguish between harmful and beneficial substances. It includes both harmful substances (like heavy metals, pesticides, or industrial pollutants) and beneficial minerals (like calcium and magnesium).

Other Important Measures

• pH Level: Indicates the acidity or alkalinity of water, which affects corrosion and taste.
• Presence of Specific Contaminants: Such as nitrates, arsenic, lead, or chlorine, which can be harmful even in low concentrations.
• Microbial Testing: Checks for bacteria, viruses, and parasites.
• Chemical Testing: Detects specific chemical pollutants or residues.

While TDS is a useful parameter for assessing the overall dissolved content in water, it is not a comprehensive measure of water purity.

What are the standard TDS values after filtration?

After RO Filtration:

RO systems are designed to significantly reduce TDS, usually by 90-99%.
Ideal Range: 50 to 150 ppm.

This range is considered ideal because it indicates that the RO system is effectively removing most of the dissolved solids while retaining some essential minerals for a balanced taste.

TDS Level Chart for Drinking Water