Water Purifier Buying Guide

best water purifiers

In our daily lives, having access to clean and safe drinking water is crucial for our well-being. With the increasing concerns about water pollution, a reliable water purifier is no longer a luxury but a necessity. If you are planning to buy a water purifier, this guide is here to help you make the right choice without getting lost in technical jargon.

1. Know Your Water

Understanding the quality of water in your area is the first step. Is it hard water or soft water? Does it have impurities or high TDS (Total Dissolved Solids) levels? Many purifiers are designed to address specific water issues, so knowing your water type helps in picking the right one.

The acceptable TDS level for drinking water can vary based on regional standards, but generally, a TDS level of 300 ppm or lower is considered good for drinking. When it comes to choosing a water purifier based on TDS levels, different purifiers are designed for specific ranges.

Also see: Best TDS Meters

RO Purifiers are best for high TDS Water (above 300 ppm). UV and UF Purifiers are good for low TDS Water (up to 300 ppm). Activated Carbon Filters are used for low to moderate TDS water.

Before purchasing a water purifier, it’s advisable to test the TDS level of your water to determine the most suitable type of purifier for your specific needs.

2. Types of Water Purifiers

There are different types of water purifiers available, each with its own set of pros and cons. The common ones include:

  • RO (Reverse Osmosis): Suitable for areas with high TDS levels, RO purifiers are effective in removing impurities and heavy metals.
  • UV (Ultraviolet): Ideal for water with low TDS, UV purifiers use UV rays to kill bacteria and viruses.
  • UF (Ultrafiltration): Best for water with low TDS, UF purifiers can remove bacteria and cysts.
  • Activated Carbon Filters: These are good for removing chlorine, odor, and some chemicals from water.

Choose a purifier based on the quality of your water and your specific purification needs. I also wrote a detailed article explaining different Types of water purifiers. You should read this article to understand how different types of water purifiers work.

3. Storage Capacity

Consider the storage capacity of the water purifier, especially if you face frequent power cuts or have a large family. Having sufficient storage ensures you always have clean water available, even during outages.

4. Water Tank Material

The material used for the storage tank of a water purifier is crucial in ensuring the quality and safety of the stored water. Common materials for water purifier storage tanks are Food-Grade Plastic, Fiberglass Reinforced Plastic, Copper, and Stainless Steel. Each has its own pros and cons. Let’s discuss each in detail.

Food-Grade Plastic (Polypropylene or ABS):

  • Advantages: Many water purifiers use food-grade plastics such as polypropylene (PP) or acrylonitrile butadiene styrene (ABS) for their storage tanks. These materials are durable, lightweight, and resistant to corrosion. They also meet safety standards for contact with drinking water.
  • Considerations: Ensure that the plastic used is labeled as “food-grade” to avoid any potential leaching of harmful substances into the water. Regular maintenance and cleaning are important to prevent the growth of bacteria.

Stainless Steel:

  • Advantages: Stainless steel is known for its durability, resistance to corrosion, and ability to maintain water quality. It is less likely to leach harmful substances into the water and provides a sleek and modern look.
  • Considerations: Stainless steel tanks are generally heavier and more expensive than plastic ones. However, they are a good choice for those who prioritize durability and long-term reliability.

Fiberglass Reinforced Plastic (FRP):

  • Advantages: FRP tanks are corrosion-resistant and lightweight. They are suitable for high-humidity environments as they do not rust. FRP tanks are also resistant to the growth of bacteria.
  • Considerations: While they are durable, FRP tanks may be more expensive than plastic ones. However, their longevity and resistance to various environmental factors make them a reliable choice.


  • Advantages: Copper has natural antimicrobial properties, which can help inhibit the growth of bacteria and other microorganisms. It is also corrosion-resistant.
  • Considerations: Copper tanks can be more expensive, and there is a risk of excessive copper leaching if water is stored for extended periods. Regular cleaning and maintenance are important.

5. Budget-Friendly Options

There are water purifiers available for every budget. Look for features that meet your requirements without burning a hole in your pocket. Some brands offer quality at affordable prices, so explore different options.

6. Maintenance and Service

Check the maintenance requirements of the water purifier. Opt for models that are easy to clean and maintain. Also, consider the availability of service centers in your area for prompt assistance in case of issues.

7. Certification Matters:

Ensure that the water purifier you choose has the necessary certifications from authorized bodies. Certifications like ISI, CE, and others guarantee that the purifier meets certain quality and safety standards.

Here are some common water purifier certifications and what they signify:

  1. ISI (Indian Standards Institute): The ISI mark is a certification provided by the Bureau of Indian Standards (BIS) in India. It indicates that the product complies with the Indian quality standards and specifications.
  2. NSF International (NSF): NSF is a non-profit organization that develops standards for various products, including water purifiers. NSF certification ensures that the purifier meets specific health and safety standards. Look for certifications like NSF/ANSI 42 and NSF/ANSI 53 for water treatment devices.
  3. CE Marking (Conformité Européene): The CE marking is a certification that indicates a product’s compliance with European Union (EU) safety standards. While it is not specific to water purifiers, some manufacturers may seek CE certification to demonstrate adherence to EU regulations.
  4. WQA (Water Quality Association): WQA is a trade association that provides certifications for water treatment products. Look for the WQA Gold Seal, which indicates that the product has been tested and certified by WQA for performance and safety.
  5. UL (Underwriters Laboratories): UL is a global safety certification company. Water purifiers with UL certification have been tested for safety and compliance with specific standards.
  6. RoHS (Restriction of Hazardous Substances): While not specific to water purifiers, the RoHS certification ensures that the product is free from certain hazardous substances, such as lead and mercury.
  7. WaterSense: WaterSense is a program by the U.S. Environmental Protection Agency (EPA) that focuses on water efficiency. WaterSense-certified products, including some water purifiers, are designed to use water more efficiently without sacrificing performance.
  8. ISO 9001:2015: ISO 9001:2015 is a quality management system certification. While not water purifier-specific, it indicates that the manufacturer follows a systematic approach to quality management.

When purchasing a water purifier, it is advisable to check for relevant certifications to ensure that the product meets industry standards for quality, safety, and performance.

8. Water Wastage

RO purifiers, while effective, can produce significant water wastage. If water conservation is a concern for you, consider models with water-saving technology or ones that reutilize rejected water.

Different companies have developed different water-saving technologies with the aim to minimize water wastage during the purification process. Now companies have developed high-efficiency membranes that retain contaminants while allowing more water to pass through. This reduces the amount of reject water produced during the purification process.

The auto-flushing system used in some modern RO purifiers automatically flushes out impurities from the RO membrane. This helps extend the life of the membrane and save water. Certain RO purifiers use water recirculation systems to redirect rejected water back into the purifier for reprocessing. This minimizes water wastage.

In some of the advanced water purifiers, companies use sensors and controllers that adapt the purification process based on real-time water quality. This ensures that the system only purifies water when necessary. In the end, It reduces unnecessary water usage. Some advanced RO purifiers feature zero water wastage technology, which aims to eliminate the discharge of rejected water altogether. These systems often use innovative methods to recycle or repurpose the rejected water, making the purification process more environmentally friendly.

9. User-Friendly Features

Look for user-friendly features that make maintenance hassle-free and ensure that you get clean water consistently. Some good user-friendly features include Filter Replacement Indicators, Auto Shut-Off, Transparent Water Tank. Smart Display, One-Touch Operation, Child Lock, Quick-Change Cartridges, Self-Cleaning Function, and Water Dispensing Options. We have also seen modern water purifiers with Mobile App connectivity. So, users get alerts when it is time to change filters and real-time TDS details.

10. Brand Reputation

Opt for a purifier from a reputable brand with a good track record. Reviews and feedback from other users can also guide you in choosing a reliable and efficient water purifier. Kent, Aquaguard, Pureit, Livpure, Havells, AO Smith, AO Smith, and Blue Star are some reputed water purifier brands in India. These brands are known for quality products and good after sales service.

11. Warranty and After-Sales Service

Check the warranty period offered by the manufacturer. Additionally, inquire about the after-sales service and the availability of spare parts. A good warranty and service support provide peace of mind in the long run.

Wrap Up

In conclusion, buying a water purifier need not be a daunting task. By considering your water quality, budget, and specific needs, you can find the perfect water purifier to ensure you and your family have access to safe and clean drinking water every day.

Read: Best Water Purifiers in India

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