If you live in a major Indian city, you’ve probably heard the term “TDS” thrown around by your plumber, your RO service technician, or even your neighbors. You might have even seen a mechanic dip a little pen-like device into a glass of water and shake their head at the number on the screen.

But what exactly is TDS? Is a high number always dangerous? And most importantly, how does it affect the water your family drinks every day?
Let’s break it down in simple, human terms—no confusing science jargon.

What is TDS?
TDS stands for Total Dissolved Solids. Imagine taking a teaspoon of salt and stirring it into a glass of water until it completely disappears. The water looks perfectly clear, but the salt is still there.

That’s exactly what happens to the water traveling to your home. As water flows from rivers or ground borewells through city pipes, it picks up dissolved solids. These solids include good things (like calcium and magnesium) but also bad things (like excess sodium, arsenic, heavy metals, and industrial chemicals). The TDS meter measures the total concentration of all these dissolved elements combined.

How Do You Know if Your TDS is Too High? (Without a Meter)
Even if you don’t own a TDS testing meter, your home gives you plenty of warning signs that your water is “hard” or high in TDS:
The Taste Test: The water tastes slightly salty, bitter, or metallic.

White Crust on Taps: You notice stubborn white, chalky stains around your kitchen sinks, bathroom faucets, and showerheads.
Stomach Upsets: Frequent, unexplained digestion issues or acidity in the family.
Soap Doesn’t Lather: When washing your hands, the soap feels sticky and doesn’t create much foam.

What is the “Safe” Level of TDS?
According to health guidelines and the Bureau of Indian Standards (BIS):
Under 50 ppm: The water is almost too pure and lacks essential minerals (often tastes flat).
50 – 150 ppm: Excellent for drinking. Sweet taste and perfectly balanced.
150 – 250 ppm: Good for drinking.
250 – 500 ppm: Fair, but starting to get heavy.
Above 500 ppm: Unsafe for regular drinking. It requires immediate purification. (In many parts of Delhi, Mumbai, and Bengaluru, borewell water easily crosses 1000+ TDS!).

The Big Myth: “Boiling Water Fixes High TDS”
This is a very common misconception. Boiling water only kills bacteria and viruses. It does not remove dissolved solids like salt or heavy metals. In fact, because boiling evaporates some of the water, it actually leaves the remaining water with a higher concentration of TDS!

The Only Real Solution: Reverse Osmosis (RO)
If your home’s water has a TDS level above 300, basic UV or UF filters will not work. They only kill germs but let the heavy metals pass right through.

You need a Reverse Osmosis (RO) water purifier. The RO membrane is so tightly woven that it literally blocks dissolved salts and heavy metals, flushing them down the drain and leaving only pure, safe water for your family.

Are You Worried About Your Water Quality?
You shouldn’t have to guess what’s in your drinking water. If your RO water has started tasting a bit off, or if your machine is overdue for a checkup, it’s time to act.

At RO Sale & Services, our expert technicians don’t just change filters—we thoroughly check your water’s TDS levels to ensure your machine is perfectly calibrated for your family’s health.

👉 Get your water and your RO machine checked today!

Book a Home Service Visit starting at just ₹299, or Call/WhatsApp us at +91 7763003691 (Service available in 100+ cities across India).