In the realm of water quality, TDS, or total dissolved solids, is a key indicator. As its name suggests, TDS testers offer a convenient way to assess the quantity of ionized solids within a liquid or solution, eliminating the need for the cumbersome process of evaporating the liquid and measuring the remaining elements. Interestingly, pure H2O boasts a TDS value of zero, signifying the absence of ionized solids with electrical charges. To quantify TDS levels, an electrical current is utilized to measure electrical conductivity (EC) within the water.

Despite its importance, there are several misconceptions surrounding TDS testers and the concept of TDS itself. Here, we present five less commonly known facts about TDS in water.

The Health Aspect of TDS

TDS is often associated with water contaminants like sewage and runoff. However, TDS isn't universally detrimental or safe. The U.S. Environmental Protection Agency (EPA) sets the maximum permissible TDS level in drinking water at 500 parts per million (ppm). Nonetheless, a TDS value below 500 ppm doesn't necessarily indicate that water is safe for consumption. TDS testing alone cannot identify the specific dissolved elements. Hence, it's typically part of a comprehensive water-quality assessment, which considers other factors like temperature, conductivity, salinity, and pH.

Variability in TDS Testers

Not all TDS testers are equal. While any dissolved element in water carries an electrical charge, some TDS testers may not effectively detect poorly conducting elements such as oils or certain pharmaceutical chemicals. Before deeming TDS readings as "safe," it's crucial to understand your tester's sensitivity to EC.

TDS Testers and Hard Water

TDS levels can be used to identify hard water, characterized by elevated mineral levels, primarily magnesium and calcium. Hard water leaves mineral deposits in drains, showers, and appliances, impacting taste, skin comfort, plumbing, and cleaning. TDS testers can quantify water "hardness," helping homeowners take appropriate measures.

Diverse Applications of TDS Testing

While often associated with water safety, TDS testing has broader applications. It plays a vital role in scientific, medical, and environmental research and finds use in fields like aquaculture, renewable energy, hydraulic fracking, and food and beverage production, among others.

Organic TDS and Limestone Formation

Remarkably, high organic TDS levels are responsible for the formation of limestone deposits around hot springs, as observed in Mammoth Hot Springs in Yellowstone National Park. Here, hot water's interaction with limestone layers deep within the earth's crust leads to the formation of carbonic acid. Upon reaching the surface and coming into contact with air, CO2 is released, resulting in the conversion of dissolved limestone into solid mineral deposits.

For a deeper understanding of TDS readings and TDS tester usage, it's essential to explore the unique features and applications of your chosen tester. If you're interested in water-quality monitors with TDS testing capabilities, you can explore Global Electronics Instruments' by visiting www.ge-india.com