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Understanding Water TDS Level and How RO Purifiers Can Help
Oct. 7, 2025
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Do you know the TDS level of your drinking water? TDS (Total Dissolved Solids) is one of the most important factors that determine whether your water is truly safe and healthy. It not only impacts taste and hydration but also affects your long-term health and even your home appliances.
In this guide, you’ll learn:
✅ What TDS is and how it’s measured
✅ WHO & BIS recommended TDS levels for drinking water
✅ Why both low and high TDS can be a problem
✅ How to reduce high TDS (and when to increase low TDS)
✅ The ideal TDS level after RO purification
🌊 What Is TDS in Water?
TDS (Total Dissolved Solids) measures the amount of organic and inorganic substances dissolved in water. These include:
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Minerals: Calcium, magnesium, potassium, sodium
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Salts: Chlorides, sulfates, bicarbonates
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Heavy Metals: Lead, arsenic, mercury (in contaminated sources)
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Other contaminants: Industrial and agricultural residues
👉 TDS is measured in ppm (parts per million) or mg/L using a digital TDS meter.
While some minerals are beneficial, excess TDS can make water unsafe, and too low TDS may strip away essential nutrients.
✅ Ideal Water TDS Levels for Drinking
Here’s the TDS chart you should follow:
| TDS Level (ppm) |
Water Quality |
Suitability |
| 0 – 50 |
Poor (Too pure, lacks minerals) |
❌ Not ideal long-term |
| 50 – 150 |
Excellent |
✅ Best for health & taste |
| 150 – 250 |
Good |
✅ Acceptable |
| 250 – 300 |
Fair |
⚠️ May need purification |
| 300 – 500 |
Poor |
❌ Needs RO purification |
| 500+ |
Unsafe |
❌ Not recommended |
📌 WHO Recommendation (2025): Below 300 ppm for safe drinking water.
📌 BIS (India): Acceptable up to 500 ppm, but best range is 50–150 ppm.
⚠️ Why Is High TDS in Water a Concern?
Drinking water with high TDS can cause:
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Health Risks: Excess salts, fluoride, arsenic, or lead → kidney stress, bone weakness, hypertension.
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Unpleasant Taste: Salty, bitter, or metallic taste.
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Appliance Damage: Scaling in RO purifiers, kettles, washing machines, and pipes.
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White Stains: On utensils, tiles, and bathroom fittings.
Example: Borewell water often has TDS levels between 500–2000 ppm, making RO purification necessary.
⚖️ What Happens If TDS Is Too Low?
Ultra-low TDS water (below 50 ppm) is not unsafe but:
❌ Lacks calcium & magnesium → mineral deficiency long-term
❌ Tastes flat or bland
❌ Less effective at replenishing electrolytes → may cause fatigue in athletes & elderly
👉 That’s why water between 50–150 ppm is ideal — balanced, tasty, and healthy.
🔧 How to Reduce High TDS in Water
The most effective solution is an RO (Reverse Osmosis) purifier:
💡 Tip: If your water already has low TDS (<150 ppm), avoid RO. Instead, use UV/UF purifiers or a TDS controller to maintain minerals.
💧 Best TDS Level for RO Water
After RO purification, the ideal TDS should be 70–150 ppm.
This range ensures:
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✅ Safe removal of harmful contaminants
-
✅ Retains essential minerals for health
-
✅ Balanced taste & hydration efficiency
👉 If your RO water has TDS <50 ppm, install a mineral cartridge/remineralizer.
🛡️ Why Choose an RO Water Purifier?
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✅ Eliminates harmful toxins (arsenic, lead, fluoride, nitrates)
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✅ Protects appliances from scaling damage
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✅ Enhances taste of drinking water
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✅ Safe for long-term consumption with remineralization
❓ Frequently Asked Questions (FAQs)
1. What is the best TDS level for drinking water?
👉 50–150 ppm is ideal for both taste and health.
2. Is low TDS harmful?
👉 Below 50 ppm is not dangerous but lacks essential minerals.
3. What is the maximum safe TDS for drinking water?
👉 WHO: <300 ppm, BIS (India): up to 500 ppm.
4. Do I need RO for municipal water?
👉 If TDS >250 ppm → Yes.
👉 If TDS <150 ppm → Use UV/UF purifier instead.
5. Does boiling reduce TDS?
👉 No. Boiling kills bacteria but does not lower TDS.
🟩 Final Thoughts
Your water’s TDS level plays a direct role in your health, taste preference, and appliance life.
✅ Keep TDS between 50–150 ppm for the best balance.
✅ Test your water regularly with a TDS meter.
✅ Choose your purifier based on source water TDS (RO for high TDS, UV/UF for low TDS).
🚰 Drinking water that’s pure, safe, and mineral-rich is not a luxury — it’s a necessity for your family’s health.
Aslo Read,
Also Know:
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