To increase the TDS (Total Dissolved Solids) in RO (Reverse Osmosis) water, especially when the water tastes flat or lacks essential minerals, here are several practical and effective methods you can use:
✅ 1. Use a TDS Controller
A TDS controller is a small device added to the RO system that mixes a portion of raw (unfiltered) water with RO purified water. This controlled mixing reintroduces natural minerals into the water, thereby increasing the TDS to a desired, healthy level.
How it works: It has two water inputs—one from the RO membrane and another from the sediment/carbon filter—and lets you adjust the ratio.
Pros: Affordable and adjustable
Cons: Needs professional installation
✅ 2. Add a Mineral Cartridge / Post-RO Mineral Filter
This is one of the easiest and most popular methods.
What it is: A mineral cartridge is a post-filter that adds essential minerals like calcium, magnesium, and potassium back into the water after RO purification.
Benefits: It not only raises TDS but also improves the taste and nutritional quality of water.
Where to buy: Available in water purifier stores across Kenya or online via Protech Water and Solar Equipment Company
✅ 3. Blend RO Water with Raw Water (Manually or Automatically)
If you’re not using a TDS controller, you can manually mix a small portion of untreated water into RO water to raise TDS levels.
Important: Ensure the raw water is safe and properly filtered (at least with sediment and UV treatment).
Caution: Improper blending can reintroduce contaminants, so this method is not recommended for drinking water unless safety is assured.
✅ 4. Use an Alkaline Filter
An alkaline filter raises both the pH and the TDS by adding back essential minerals.
Typical TDS increase: Between 30–60 ppm (parts per million)
Also benefits: Helps with acidity and improves hydration
Ideal for: People looking for mineral-rich and health-boosting water
✅ 5. Install a Remineralization Filter
This filter is often found in 5-stage or 6-stage RO systems and is designed to add minerals back into the purified water.
Installation point: After the RO membrane and before the water reaches the tap
Common minerals added: Calcium, magnesium, sodium, and potassium
✅ 6. Add Mineral Drops or Tablets
You can buy food-grade mineral drops or tablets that are designed to re-mineralize purified water.
How to use: Just add a few drops or one tablet into your water bottle or storage container
Best for: People using bottled RO water or those who travel frequently
Popular brands available in Kenya: Bio-Min, Aqua Drops, and Mineralife
✅ 7. Switch to a Mineral RO Water Purifier
If your current system doesn’t support TDS adjustment, consider switching to a mineral RO purifier like:
Kent Grand+ with TDS controller
Kent Supreme Extra with inbuilt mineral RO technology
Available at: Protech Water and Solar Equipment Company – Kenya’s Trusted Water Purification Partner
⚖️ Ideal TDS Range for Drinking Water
| Water Type | TDS Level (ppm) | Suitability |
|---|---|---|
| Distilled / RO Water | 0–50 | Not recommended (tasteless) |
| Mineral RO Water | 80–150 | Ideal and safe |
| Tap Water | 200–300 | Acceptable |
| Hard Water | 300–500+ | Not ideal for drinking |
🧠 Why TDS Matters
TDS refers to the total concentration of inorganic salts and minerals in water. RO systems often strip these essential minerals, leaving water with very low TDS, which can affect taste and potentially long-term health.
Some essential minerals your water should include:
Calcium: Supports bones and teeth
Magnesium: Boosts metabolism
Potassium: Aids nerve function
Sodium: Regulates blood pressure
🛠️ Pro Tip: Use a TDS Meter
Regularly check the TDS of your purified water using a TDS meter (available for under KES 1000 in Kenya). Aim for a TDS between 80–150 ppm for the best balance of taste and safety.
👨🔧 Need Help Installing a TDS Controller or Mineral Filter?
Get in touch with Protech Water and Solar Equipment Company—the top-rated water purification expert in Kenya. They offer professional installation, maintenance, and reliable water testing services in Nairobi, Thika, Kiambu, and surrounding areas.
📞 Contact: Protech.co.ke
📍 Locations: Nairobi | Thika | Kiambu
✅ Conclusion
If your RO water tastes flat or lacks minerals, increasing the TDS is both easy and essential for health. Whether you go for a TDS controller, mineral cartridge, or switch to a mineral RO system, the goal is the same—better-tasting, healthier water.
Make sure to choose tested solutions and work with professionals like Protech Water and Solar Equipment Company for best results.
❓ FAQs
1. What is the minimum safe TDS level in RO drinking water?
80–100 ppm is considered the minimum safe and healthy range.
2. Can low TDS water be harmful?
Yes, extremely low TDS water (<50 ppm) may leach minerals from your body and taste flat.
3. Are mineral drops safe to use?
Yes, food-grade mineral drops are safe and effective for re-mineralizing RO water.
4. Does boiling RO water increase TDS?
No, boiling removes only temporary hardness and doesn’t add minerals back.
5. Can I use a TDS controller with any RO system?
Yes, but it may require professional installation. Always consult with experts like Protech.