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Best Selling Under Sink Water Purifiers9 min read

under sink water

Under-sink water purifiers are now a must-have in every home. Depending on the manufacturer, various water purifiers are offered on the market. Some are cheap and only clean the water, while others cost more and can do more, like adding minerals to distilled water or adding an extra layer of filtration to give users more peace of mind.

Depending on what you want, there are three central water purifiers: reverse osmosis, ultraviolet, and gravity-based purifiers. While we are all familiar with water purifiers that are wall-mounted or table-top, there is another variant called the under-sink water purifier. Still, it works just like the more common and well-known types of water purifiers. The only difference here is that this appliance is installed under the sink. Hence, the name “under sink” cleaner. In the case of this particular cleaner, it also comes in three major variants; Reverse Osmosis, Ultra Violet, and Gravity Based.

What is an under-sink water purifier, and how does it work?

An under-sink water purifier installed at the sink’s base is an under-sink water purifier. It is physically connected to the water transportation pipeline. Under-sink water purifiers are like other water purifiers in that they use more than one method to eliminate contaminants in the water. The linked tap provides access to this cleansed water, which can be directly drunk. The best thing about this water purifier is that it uses reverse osmosis, more commonly called RO, to clean the water. RO uses a membrane that lets some water through but keeps out ions, unwanted molecules, and larger particles. This process separates dissolved and suspended chemicals and biological elements like bacteria from the water.

As technology has improved, many water purifiers have added features to improve the water’s nutrient and impurity levels. Because they have a hydrostatic tank, water purifiers under the sink can move a lot of water. This allows the water purifier to fill containers much faster than its wall-mounted counterparts.

Advantages and disadvantages of under-sink water purifier:

One of the most substantial benefits of using an under-sink water purifier is how much space it frees up in your kitchen because it is installed beneath the sink. However, all devices come with their benefits and challenges. We have listed some advantages and disadvantages below for our readers to understand if this cleaner is the right one for you.


  • As we mentioned earlier, it is a significant space saver. Its components won’t tangle with other kitchenware, and none of its features will ever come off, so you won’t have to deal with that problem. It is tucked safely under the sink, out of sight.
  • These sink water purifiers come attached to a hydrostatic tank, filling up water much faster than regular water purifiers.
  • There is no spillage of water as it is attached to the sink. Just place the bottle and wait for it to fill up.
  • It can be attached without difficulty and doesn’t require the fuss of hanging any component on the wall, unlike its wall-mounted counterpart.
  • It contains a hydrostatic storage tank that stores purified water and can be used without electricity. 
  • Under-sink water purifiers provide variations in design and functionalities, which is impossible with their regular counterparts.
  • It requires comparatively lower maintenance. It does not affect the aesthetics of the kitchen. Only its faucet is visible in the kitchen, which brings no evident changes to the outlook and feel of the kitchen.


  • It requires an electric socket under the sink, which can sometimes become an issue.
  • It is susceptible to mishaps if water is spilled near the electric socket. This requires added care. 
  • Improper device installation can lead to water leakage and improper functioning of the water purifier.

Things to remember

If you remember a few things before you buy the under-sink water purifier, it will be easier to put it together. After all, you want to save your hard-earned money on something you can afford.

  • Maintenance: Pick a device that requires minimal maintenance. Ensure that you change the filter attached to it at regular intervals.
  • Budget: It’s a good practice to understand how much it will cost you on average to maintain it. Replacing parts or simply keeping them functional can cost a certain amount regularly. Purchase only if you can afford it.
  • Clean space: Ensure the room is clean and free from water leakage. Make sure to clean the area once every few days and check for water leakage.
  • Power supply: You will need to install an electric panel where the device is kept. Ensure the board is properly installed to avoid a short circuit.
  • Water faucet: Make sure your sink has sufficienr space to fix the tap attached to the water purifier.

Like its hugely popular counterpart, the under-sink water purifier comes in different variants depending on the type of purifying method you wish to use. The mechanism of wall-mounted water purifiers and under-sink water purifiers is the same. As a result, they have the same capability in terms of purifying the water. Before the water reaches the tap, the under-sink purifier attaches to the pipes under your sink and cleans them. Metals and volatile organic compounds, which are more dangerous contaminants, will be taken out by this method. You can get one that filters the specific contaminants that your water supply might have. Some municipal or healthy water might be high in lime, arsenic, or nitrates, and you can get filters that specialize in filtering these contaminants. The best choice is to get a two-step water filter, one for filtering sediments and chlorine and another for filtering toxic chemicals.

Here are the top 5 best under-sink water purifiers in India

AO Smith Z2+ Under The Counter RO+MIN-TECH Water Purifier – 5 L, White

About this item

  • SSM TECHNOLOGY WITH PATENT (SIDE STREAM RO MEMBRANE): Appropriate for water with low and high TDS (up to 2000 ppm). It reduces water waste and enhances pure water recovery. The MIN-TECH (MINERALISER TECHNOLOGY) system adds minerals like calcium and magnesium back into the water. This ensures that the water has a balanced pH and a fresh, natural taste, two of the most significant things for drinking water. 
  • The RO Membrane element in the A. O. Smith RO water purifier has been tested and approved by WQA to the material criteria of NSF/ANSI 58 standards. Included Components: Water Purifier, Manual, Tubes & Connectors, Mounting Screws, Warranty .1-Year Full Coverage Warranty (Or) the Ro Membrane has a two-year warranty if the input water contains TDS-Le.
AO Smith Best Selling Under Sink Water Purifiers
KENT Excell Plus RO Water Purifier (11003) | RO+UV+UF+TDS Controller | Under the Counter | Patented Mineral RO Technology| 7L Storage | 15 L/hr Output | White

About this item

  • Suitable for TDS (500-2500). Before you buy a water purifier, you should use a TDS meter to find out what your water’s TDS is. Product Dimensions: 390 cms (Length) X 200 cms (Width) X 520 cms (Height). Kindly note: For every liter of purified water, the system discards 650 milliliters of water. 
  • Collecting the water in a container and using it to wash your clothes and clean your kitchenware is advised.
  • Includes: Kit for installation, a water purifier, and a user guide.
kent Best Selling Under Sink Water Purifiers
Kent Sterling Plus RO+UV+UF+TDS Cont. Under The Sink RO Water Purifier, 6 Liter (White & Blue)

About this item

  • Sterling+ combines double cleaning of ro+uv/uf with a TDS control valve to remove dissolved impurities such as arsenic, rust, chemicals, bacteria, viruses, and salts and make water 100% pure and safe for consumption.
  • Sterling+ features a fully automatic capability that enables the cleaner to start the purifying process whenever the amount of filtered water in the storage tank drops below the maximum level.
  • High storage capacity: The 6L internal hydrostatic storage tank of the sterling+ ensures an ongoing supply of cleaned water without needing energy.
kent sterling Best Selling Under Sink Water Purifiers
Bepure UTS Under Sink Water Purifier 12L with RO+UV+UF+TDS Water Purification| 8 Stage Water Purification| Under Counter Water Purifier| Works Upto 3000ppm TDS|

About this item

  • 8 Stage Ultra-Purification process with Mineral Technology by TDS controller providing not just pure but healthy water. The full storage tank of the under-sink RO is 12L.
  • The water purifier includes a free stainless steel tap and a 12-liter hydropneumatic storage tank.
  • Ideal for small kitchens and is fitted beneath the sink or counter.
bepure Best Selling Under Sink Water Purifiers
Purella Ortho Under the Counter RO Water Purifier, 10 Lt Storage Patented Mineral RO Technology, Hydro Pneumatic Pressure Tank NSF certified Membrane 15 LPH Output -White (IS 16240:2015 BIS certified)

About this item

  • Power Saver and Auto Cut-off: Once the tank is full, cut off the water and electricity automatically to conserve energy and water. This feature also provides a long filter life of up to 6000 liters. The Dry Run Protection prevents damage to parts by automatically stopping the filtration process during no/low water supply.
  • 5-Stage Filtering System: With specialized filters, including the Spun Filter, Wound Filter, Granulated Activated Carbon Filter, RO Membrane, and Post Carbon Filter, it provides filtration at a rate of 10-15 liters per hour while preserving up to 30% water recovery.
purella 1 Best Selling Under Sink Water Purifiers

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