Gravity vs RO Water Purifiers: Learn The Difference And Make Smarter Choices

Clean drinking water is essential for health and well-being. With growing concerns about water contamination, choosing the right water purifier has become a priority for many households. Among the most commonly used types are Gravity-based water purifiers and Reverse Osmosis (RO) purifiers. Though both aim to provide safe drinking water, they differ significantly in how they operate and the kind of water they are best suited for.

Gravity vs RO Water Purifiers: Learn The Difference And Make Smarter Choices
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This article explores the differences between gravity and RO purifiers, helping you understand their mechanisms, benefits, limitations, and which one might be the right choice for your home.

Understanding The Basics

Gravity Water Purifiers

Gravity purifiers, as the name suggests, rely on the natural force of gravity to filter water. These systems typically use a combination of sediment filters, activated carbon, and ultrafiltration (UF) membranes to remove impurities. Water is poured into an upper chamber and passes through the filters into a lower chamber, where it is stored for consumption.

These purifiers do not require electricity or running water, making them ideal for areas with limited infrastructure. They are often compact, portable, and easy to maintain. If you are looking for a new gravity water purifier under a budget for your home or office, you can read 5 Top-Rated Water Purifiers Under ₹5,000" on our website. And if you want to explore more options, try the Best Water Purifiers on Flipkart to know more

RO Water Purifiers

RO purifiers use Reverse Osmosis technology, a process that forces water through a semi-permeable membrane under pressure. This membrane filters out dissolved salts, heavy metals, chemicals, and microorganisms. RO systems often include multiple stages of filtration, such as pre-sediment filters, carbon filters, RO membranes, and post-carbon filters. If you want to explore some options of RO water purifier, click here to dive in a world of RO membranes, filters and more.

Unlike gravity purifiers, RO systems require electricity and a continuous water supply. They are more complex and typically installed under kitchen sinks or mounted on walls.

Key Differences Between Gravity And RO Water Purifier

Gravity vs RO Water Purifiers: Learn The Difference And Make Smarter Choices
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1. Filtration Technology

Gravity purifiers rely on physical filtration methods. The UF membrane is capable of removing bacteria and cysts, but it cannot eliminate dissolved salts or heavy metals. This makes them suitable for water that is already relatively clean.

RO purifiers use pressure-driven filtration. The RO membrane can remove up to 95–99% of dissolved impurities, including harmful substances like arsenic, fluoride, lead, and nitrates. This makes RO systems ideal for treating water that is chemically contaminated or has a high level of dissolved solids.

Also Read: 10 Best-Selling Water Purifiers Suitable For Borewell Water In India

2. Water Quality Suitability

Gravity purifiers are best suited for water with low Total Dissolved Solids (TDS), typically below 300 parts per million (ppm). This includes municipal water or water from borewells that is already treated and safe for consumption.

RO purifiers are designed for water with high TDS levels, usually above 300 ppm. They are particularly effective in areas where water contains high levels of salts, industrial pollutants, or other chemical contaminants.

3. Electricity and Water Pressure

One of the biggest advantages of gravity purifiers is that they do not require electricity or water pressure. This makes them highly practical for rural areas or places with frequent power outages.

In contrast, RO purifiers need electricity and adequate water pressure to operate. Without these, the system cannot function, which can be a limitation in areas with unreliable infrastructure.

4. Cost and Maintenance

Gravity purifiers are generally more affordable, with prices ranging from ₹1,000 to ₹5,000. They are easy to maintain, requiring only periodic cleaning and filter replacement.

RO purifiers are more expensive, typically costing between ₹8,000 and ₹20,000 or more. They require regular servicing, membrane replacement, and professional installation, which adds to the overall cost of ownership.

Gravity vs RO Water Purifiers: Learn The Difference And Make Smarter Choices
Photo Credit: Pexels

5. Water Wastage

Gravity purifiers are environmentally friendly in terms of water usage. They do not waste any water during the filtration process, making them a sustainable choice.

RO purifiers, however, can waste 2–3 litres of water for every litre of purified water produced. This is due to the nature of the reverse osmosis process, which separates impurities and flushes them out with excess water.

6. Taste and Mineral Retention

Gravity purifiers retain the natural minerals present in water, preserving its taste and nutritional value. This is beneficial for those who prefer water that tastes natural and contains essential minerals.

RO purifiers remove most minerals along with contaminants. While this ensures purity, it can affect the taste and nutritional content of the water. Some RO models include TDS controllers or mineral cartridges to reintroduce essential minerals and improve taste.

Pros and Cons Summary

Which One Should You Choose?

Choosing between a gravity and RO purifier depends on several factors. If your water source is municipal and has low TDS, a gravity purifier is sufficient and economical. If your water is from borewells or tankers and contains high levels of dissolved solids, an RO purifier is necessary to ensure safety.

Budget also plays a role. Gravity purifiers are ideal for those seeking a low-cost solution with minimal maintenance. RO purifiers, while more expensive, offer advanced protection for households dealing with poor water quality.

Infrastructure is another consideration. In areas with unreliable electricity or water pressure, gravity purifiers are more practical. For homes with stable utilities, RO systems can be a worthwhile investment.

Environmental concerns may also influence your decision. Gravity purifiers do not waste water, making them a better choice for those focused on sustainability. RO purifiers, despite their efficiency, contribute to water wastage and may require additional measures to offset this impact.

Products Related To This Article

1. MarQ by Flipkart Innopure Crux 15 L RO + UV + UF + Copper Water Purifier

2. Aqua Fresh Titanium Series

3. Pureit Wave Prime 7 L

4. LIVPURE LIV-PEP-PRO-STAR. 7

5. NATIVE By Urban Company M2

Frequently Asked Questions (FAQs)

1. What is the main difference between gravity and RO water purifiers?

Gravity purifiers use natural filtration without electricity, while RO purifiers use pressure and membranes to remove dissolved impurities.

2. Is a gravity purifier suitable for borewell water?

No, gravity purifiers are best for low TDS water. Borewell water usually has high TDS and requires RO purification.

3. Do RO purifiers waste water during filtration?

Yes, RO purifiers typically waste 2–3 litres of water for every litre purified due to the reverse osmosis process.

4. Can gravity purifiers remove viruses and heavy metals?

Gravity purifiers can remove bacteria and cysts but are not effective against viruses or dissolved heavy metals.

5. How do I check if my water needs an RO purifier?

You can use a TDS meter to measure the total dissolved solids (TDS) in your water. If it's above 300 ppm, an RO purifier is recommended.

Both gravity and RO water purifiers serve important roles in ensuring access to clean drinking water. Gravity purifiers are simple, affordable, and eco-friendly, making them suitable for everyday use in urban and rural settings with clean water sources. RO purifiers are essential in areas where water quality is compromised by industrial waste, salinity, or chemical contamination.

Before purchasing a purifier, it's advisable to test your water's TDS level and assess your household's specific needs. Many brands offer free water testing services and TDS meters to help you make an informed decision.