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What is the Best Method to Purify Water?

What is the Best Method to Purify Water?
May 24, 2025 ARTICLES

Introduction: Why Water Purification Matters in 2025

Clean water is a fundamental need for life, yet millions around the world still lack access to safe drinking water. With increasing pollution and emerging contaminants, understanding what is the best method to purify water has become more critical than ever. The quality of water directly impacts our health, making water purification a priority for every home and community.

Whether you rely on municipal water, borewell water, or natural sources, knowing the right purification technique can save you from waterborne diseases and improve the taste and odor of drinking water. In this blog, we'll explore different methods of water purification, analyze their pros and cons, and guide you to select the best water filter for home use based on your needs.


What is the Best Method to Purify Water? (Direct Answer)

There isn't a one-size-fits-all answer to the question, but the most effective method currently is Reverse Osmosis (RO) combined with UV and UF filtration, often equipped with a TDS controller. This multi-stage approach addresses a wide spectrum of contaminants including bacteria, viruses, dissolved salts, heavy metals, and sediments.

  • RO purifies water by pushing it through a semi-permeable membrane, removing dissolved impurities.

  • UV purification uses ultraviolet light to kill bacteria and viruses.

  • UF filtration removes fine sediments and cysts.

  • A TDS controller ensures essential minerals are retained in the purified water.

This integrated technology offers comprehensive purification, making it the best water filter for home use for many urban and rural households.


Types of Water Purification Methods

Boiling

Boiling is the oldest and simplest method to kill pathogens. Heating water to 100°C for 5-10 minutes kills most bacteria, viruses, and parasites. However, boiling does not remove chemical contaminants or dissolved solids and is energy-intensive.

Pros:

  • Easy and low-cost

  • Kills pathogens effectively

Cons:

  • No removal of heavy metals or chemicals

  • Taste can be affected

  • Time-consuming

Filtration (Activated Carbon, Ceramic, Sediment Filters)

Filters trap suspended particles and impurities. Activated carbon filters are particularly good at removing chlorine, bad odors, and some organic chemicals. Ceramic filters block bacteria and sediments.

Pros:

  • Improves taste and odor

  • Removes sediments and chlorine

  • Affordable

Cons:

  • Does not remove dissolved solids or viruses

  • Requires frequent cleaning/replacement

Reverse Osmosis (RO)

RO is a membrane filtration process that removes dissolved salts, heavy metals, bacteria, and viruses. It is highly effective in purifying water with high Total Dissolved Solids (TDS).

Pros:

  • Removes dissolved impurities

  • Effective against bacteria, viruses, and heavy metals

Cons:

  • Wastes some water during filtration

  • Removes beneficial minerals unless equipped with a TDS controller

  • Requires electricity and maintenance

UV Purification

UV systems expose water to ultraviolet light that kills microorganisms by destroying their DNA. UV is effective against bacteria, viruses, and protozoa but does not remove sediments or chemicals.

Pros:

  • Chemical-free disinfection

  • Effective against microbes

Cons:

  • Requires electricity

  • Does not remove dissolved solids or sediments

UF and Gravity-Based Filters

Ultrafiltration (UF) uses membranes with larger pores than RO, filtering out bacteria and cysts but not dissolved salts. Gravity filters work without electricity but have limited purification capacity.

Pros:

  • Low maintenance

  • No electricity needed (gravity filters)

  • Good for low TDS water

Cons:

  • Ineffective for high TDS or chemical contamination

  • Limited microbial removal compared to UV or RO


Comparison Table: Pros & Cons of Each Method

Method Removes Bacteria & Viruses Removes Chemicals & Heavy Metals Removes Dissolved Solids (TDS) Cost Maintenance
Boiling Yes No No Very Low Low
Activated Carbon Limited Yes (some) No Low Moderate
RO Yes Yes Yes Moderate-High Moderate-High
UV Yes No No Moderate Low
UF/Gravity Yes (bacteria only) No No Low-Moderate Low

Advanced Water Purification Technologies

RO + UV + UF with TDS Controller

Modern water purifiers combine RO, UV, and UF in a multi-stage system with a TDS controller. This setup ensures maximum removal of contaminants while retaining essential minerals for health.

  • The RO membrane removes dissolved salts and heavy metals.

  • The UV lamp disinfects water from bacteria and viruses.

  • The UF membrane filters sediments and cysts.

  • The TDS controller maintains a healthy mineral balance.

This combination is often regarded as the best water filter for home use in India, catering to diverse water qualities.

IoT-enabled Smart Water Filters

The newest trend involves smart purifiers connected to mobile apps, allowing users to monitor water quality in real-time, schedule maintenance, and optimize filter usage. These use advanced sensors for TDS, chlorine, pH, and microbial detection.


Best Water Filter for Home Use in India

Choosing the right water filter depends on your water source and quality:

  • Municipal water with low TDS: UV or UF filters may suffice.

  • Borewell or groundwater with high TDS and possible chemical contamination: RO + UV + UF with TDS controller is recommended.

  • Areas with irregular electricity: Gravity-based or UF filters are better options.

Look for certifications such as ISI and NSF to ensure reliability.


Choosing the Right Method Based on Water Source (TDS, Bacteria, etc.)

Understanding your water source is key:

  • High TDS (>500 ppm): Use RO filtration to remove dissolved salts.

  • Microbial contamination: Use UV or boiling for disinfection.

  • Turbid or sediment-heavy water: Use sediment filters or UF membranes.

  • Chemical contamination: Activated carbon filters help remove chlorine and pesticides.

Testing your water periodically can guide you in selecting and maintaining the best water purification method.


How to Maintain Your Water Purifier

Maintenance is crucial for effectiveness:

  • Replace filters as recommended (usually every 6-12 months).

  • Clean sediment filters regularly.

  • Clean UV lamps annually.

  • Ensure RO membranes are cleaned or replaced as per usage.

  • Keep the purifier and storage tanks clean to prevent bacterial growth.

Proper upkeep extends the life of your purifier and guarantees water safety.


Water Quality Standards: What You Should Know

Agencies like the World Health Organization (WHO) and the Bureau of Indian Standards (BIS) set guidelines for safe drinking water quality. Key parameters include:

  • TDS: Ideally below 500 ppm for taste and health.

  • pH: Between 6.5 and 8.5.

  • Microbial limits: Zero presence of coliform bacteria.

  • Chemical contaminants: Below harmful thresholds.

Choosing purifiers that meet these standards ensures safe drinking water.


FAQs: Answering Real User Questions

Q1: Is RO water safe to drink daily?
Yes, when equipped with a TDS controller to retain essential minerals, RO water is safe and healthy for daily consumption.

Q2: How often should I change RO filters?
Pre-filters typically every 6 months; RO membrane every 2-3 years, depending on water quality and usage.

Q3: Can UV purifiers remove chemicals?
No, UV only disinfects microorganisms; chemical contaminants require activated carbon or RO filters.

Q4: Does boiling remove heavy metals?
No, boiling only kills microbes but does not remove dissolved solids or heavy metals.


Final Verdict: Which Method Is Best for You?

The best method to purify water depends largely on your water source, budget, and specific contaminants present. For comprehensive purification, especially in India’s diverse water conditions, a multi-stage purifier combining RO, UV, and UF with a TDS controller is the most reliable and recommended solution.

Always test your water before choosing a purification method and maintain your system regularly to ensure safety and taste. With advancing water purification technology, safe and clean drinking water is accessible for every household today.


Related Reading: What is the Minimum TDS for Drinking Water?