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What is TDS in Water Purifier?

What is TDS in Water Purifier?
May 9, 2025 ARTICLES

If you are concerned about the quality of your drinking water, you might have heard about the term TDS. TDS, or Total Dissolved Solids, is one of the most important parameters that indicate whether your drinking water is safe or not. It not only affects the taste, hardness, and appearance of the water but also impacts your health and household appliances.

In this blog, we will explain what TDS is, how it affects water quality, why managing TDS is important, and how RO water purifiers help in maintaining the right TDS levels. You will also learn about essential tools like the TDS Meter and TDS Adjuster, available at Romegamart, that can help you monitor and control your water's TDS level.


What is TDS in Water?

TDS stands for Total Dissolved Solids, which refers to the inorganic salts and small amounts of organic matter dissolved in water. These substances can include:

  • Calcium

  • Magnesium

  • Potassium

  • Sodium

  • Bicarbonates

  • Chlorides

  • Sulfates

  • Heavy metals (lead, arsenic, mercury, etc.)

  • Industrial pollutants and pesticides

These dissolved solids can come from natural sources, sewage, urban runoff, industrial wastewater, chemicals used in water treatment, and plumbing materials.


Why is TDS Important in Drinking Water?

TDS is an essential factor in assessing the purity, taste, safety, and suitability of drinking water. High TDS levels may:

  • Make water taste salty, bitter, or metallic

  • Cause health risks due to the presence of heavy metals and contaminants

  • Lead to scaling and corrosion in water heaters, pipes, and appliances

  • Reduce the effectiveness of soaps and detergents

On the other hand, very low TDS water may lack essential minerals and taste flat or acidic.


Ideal TDS Level for Drinking Water

According to the Bureau of Indian Standards (BIS), the acceptable TDS level in drinking water is:

TDS Level (ppm) Water Quality
50 – 150 Excellent
150 – 250 Good
250 – 350 Fair
350 – 500 Poor (Needs Purification)
Above 500 Unsafe (Not recommended)

While BIS permits up to 500 ppm, the ideal range is 50–150 ppm for good taste and safe drinking.


Causes of High TDS in Water

There are several reasons why your water might have high TDS levels:

  • Borewell or groundwater sources often contain high levels of calcium, magnesium, and fluoride

  • Industrial and agricultural activities can increase nitrates, sulfates, and heavy metals

  • Old plumbing systems may leach lead or iron into the water

  • Municipal water supply may contain chlorine and dissolved salts from treatment processes


How to Measure TDS in Water?

To accurately measure the TDS in your water, you can use a digital TDS meter. This device shows the TDS level in ppm (parts per million).

You can easily buy a TDS Meter online to monitor the water quality at home. It is a must-have tool for every household to ensure the water purifier is working properly.


How RO Water Purifier Helps Control TDS?

An RO (Reverse Osmosis) water purifier is one of the most effective systems to reduce and manage TDS levels in drinking water. Here's how it works:

  • Water is passed through a semipermeable membrane

  • This membrane allows only water molecules to pass through, blocking dissolved salts, metals, and impurities

  • The result is clean, low-TDS, safe drinking water

If you live in an area with high TDS levels (more than 300 ppm), using an RO purifier becomes essential.


RO Water with Balanced TDS: How to Maintain It?

While RO systems reduce TDS significantly, ultra-low TDS water may not be ideal either. It may lose essential minerals required for your body. That’s where a TDS Adjuster or TDS Controller comes in.

You can buy a reliable TDS Adjuster to balance the TDS after RO filtration and retain necessary minerals in your water.


Benefits of Maintaining Proper TDS in Drinking Water

  • Improved taste of drinking water

  • Protection from health issues due to heavy metals or excess sodium

  • Longer lifespan of appliances like water heaters and kettles

  • Better digestion and hydration with the right mineral balance


Common Myths About TDS in Water

Myth 1: Low TDS water is always good.
Fact: Water with extremely low TDS (<50 ppm) can be acidic and tasteless, and may lack essential minerals.

Myth 2: All high TDS water is unsafe.
Fact: If the high TDS is due to safe minerals like calcium and magnesium, it may not be harmful.

Myth 3: Boiling water reduces TDS.
Fact: Boiling kills microbes but does not remove dissolved solids.


How to Choose the Right Water Purifier Based on TDS?

Use this guide to choose the right purification method:

TDS Range Recommended Purification Method
< 300 ppm UV or UF purifiers
300 – 1000 ppm RO purifier with TDS controller
> 1000 ppm RO + UV purifier + TDS adjuster

Visit Romegamart to explore a wide range of domestic RO systems, TDS meters, and TDS adjusters for your home.


Frequently Asked Questions (FAQs)

Q1: What is TDS in a water purifier?
TDS stands for Total Dissolved Solids. It measures the concentration of dissolved minerals, salts, and impurities in drinking water.

Q2: What is the ideal TDS level for drinking water in India?
The ideal TDS range is between 50–150 ppm. BIS permits up to 500 ppm for safe drinking.

Q3: Can I drink water with very low TDS?
Water with TDS below 50 ppm may lack essential minerals. It is better to maintain it between 100–150 ppm for health benefits.

Q4: How do I test the TDS level of water at home?
You can use a TDS Meter to instantly check the TDS level of your tap or filtered water.

Q5: What happens if I drink high TDS water regularly?
It may lead to health issues due to heavy metals, affect taste, and cause scaling in appliances.

Q6: Can I increase the TDS in RO water?
Yes, with a TDS Adjuster or mineral cartridge, you can increase the TDS after purification to a safe level.


Final Words

Understanding TDS in water purifiers is essential for every household, especially in urban areas where water quality is inconsistent. Using a TDS meter to monitor, and a TDS adjuster to manage, the water’s mineral content ensures that you get safe, healthy, and great-tasting drinking water. Choose the right RO system based on your water source and TDS levels for long-term health and appliance safety.

Visit Romegamart to get access to high-quality TDS-related domestic spares, purifiers, and expert support today.