How Do Undersink Water Filters Work?

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Your tap water may seem clean, but most contaminants are invisible to the human eyes. Since your tap water comes through various pipes, it may pick up some contaminants on the way. Such contaminants can be harmful to you and your family’s health.

With that in mind, it’s essential to get a water filter for your home, and one of the best options you can consider is an undersink water filter. As its name suggests, an undersink water filter fits under your kitchen sink, making it discreet. It’s also efficient and budget-friendly.

Once installed properly, this kind of tap water filter can offer you great-tasting and crystal-clear filtered water without dealing with refilling issues. This is especially true if you’re using pitcher fillers. However, it’s wise to know how it works to make the most out of an undersink water filter.

Undersink Water Filters: What Is It And How Do They Work?

Generally, an undersink water filter is a device that eliminates various contaminants from your tap water. Since it’s a point-of-use (POU) system, it should be installed where you require access to clean water, such as a bathroom or kitchen faucet. It may also be installed in areas where you have appliances that require filtered and clean water.

The water delivery process of undersink water filters is simple. The filter gets water through a flexible plastic tube directly connected to your water line under the sink. The tube diverts some water to the filtration system. Then, once you turn on the faucet, you’ll get filtered water instantly.

Undersink water filters may also work differently depending on their type. For example, suppose you decide to install a conventional undersink water filter. In that case, it gets water from the cold-water pipe, and the water passes through another tube where contaminants will be eliminated. After that, the filtered water will flow through a flexible plastic tube. Typically, a special faucet is needed to dispense filtered water from a conventional undersink water filter.

how do undersink water filters work?
House water filtration system. Osmosis deionization system. Installation of water purification filters under kitchen sink in cupboard. Clear water concept. Small sharpness, possible granularity

Why Install An Undersink Water Filter?

Installing an undersink water filter may mean an additional expense, but it’s a perfect solution for those who want to get clean and safe water at home. If you’re unsure about whether or not to install an undersink water filter at home, here are the reasons why you should do so:

  • More Affordable

One of the reasons to install an undersink water filter is its affordability. You can enjoy savings on both the subsequent maintenance and initial purchase. Although you may have to replace its filters regularly, it’s more reasonable than buying bottled water every day.

If you’ve been spending a considerable amount of money on bottled water, an undersink water filter is a cost-effective alternative. It doesn’t only cut your monthly expenses on bottled water, but you can also ensure that you’ll get fresh and clean water all day and night.

  • Easy To Install and Maintain

An undersink water filter is easy to install and requires low maintenance. You don’t even have to hire a professional to do the job for you. Depending on your preferred undersink water filter, the installation process takes only a few minutes. The only thing you should do is follow the provided instructions in your unit’s user manual.

  • Highly Efficient

Another reason to install undersink water filters is that they’re highly efficient in removing harmful chemicals and contaminants in your tap water. They may even retain the natural minerals your body requires to stay healthy.

  • Improve The Tap Water’s Smell and Taste

Due to the chlorine and fluoride present in tap water, you may notice an unpleasant smell or taste depending on where you live. If these unpleasant odours or tastes turn you off and make you consume more bottled water, having an undersink water filter can be an excellent solution. It works by filtering unnecessary contaminants and minerals, improving your water’s taste and smell.

  • Mobile and Space-Saver

The other top reason for installing undersink water filters is their mobility and space-saving feature. While some home water purification systems require ample space, an undersink water filter requires less space and works alone without the need to be paired up with some filters.

So, if you want a space-saving water filter, an undersink water filter is your best option. It can quickly fit under your sink, leaving you with more space that can be used for other purposes.


Now that you know how an undersink water filter works, it’s time to decide whether or not to install one for your home. Like any water filter available in the market, it can be a life-changing investment since it helps you ensure that your water is safe, clean, and healthy for everyone. However, when choosing an undersink water filter, it may come in handy to shop around and compare the different options to get the best bang for the buck.

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