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Best Under Sink Water Filter in the UK 2022

Under-sink filters are fitted under the sink and are often connected in-line with a house’s standard water pipes. Some are connected to their own dedicated tap for drinking water purposes. 

This allows your standard cold water that passes through the filter – there’s no hassle of filling up a jug!

Whilst some minor installation is required, once fitted, under-sink filters will last a very long time and all you’ll have to do is periodically change the filters. 

However, there are various under sink water filters online, so it’s worth taking some time to research them first if you’re buying one online.

This article will review the best under sink water filter brands available in the UK as well as the factors to consider before purchasing an under sink water filter. 

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Best Overall – Waterdrop 10UA Under Sink Water Filter System

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Waterdrop has built a very reputable track record for their water filtration systems and this one has come to be a bestseller worldwide. It’s a fairly straightforward but advanced one-part filtration system with five-layer filtering. 

The five-stage filtration system employed here is adept at filtering heavy metals and other contaminants including lead, chlorine, sediment, rust, arsenic, and other heavy metals.

It uses carbon filters and activated carbon blocks to perform most of the filtering. It does, however, seek to allow amounts of calcium and magnesium through, as these are crucial for our health.

It filters media down to a tiny size of just 0.5 microns too, which is much finer than other brands and will catch out very small particles. 

The Waterdrop 10UA is really easy to fit in just 3 minutes or so. It connects in-line with your cold water supply and comes with all necessary fittings for the vast majority of UK plumbing systems. Generally, no plumber is required. 

This system is also longlasting with a service life of 12 months or 8000 gallons, which is equivalent to a family’s water usage. It will last longer if you use the tap less or if there’s fewer of you in the house.

Replacing the filter is also simple and takes seconds. All components used to manufacture this filter are themselves BPA and lead-free. 


  • Filters media down to 0.5 microns
  • Fits existing taps
  • Five-stage filtering 
  • Lead and BPA-free
  • Easy fitting


  • Efficient filtering 
  • Well-made 
  • Easy to fit in just minutes
  • Long filter life


  • None

Bottom Line 

The Waterdrop 10UA filtration system is sophisticated and well-designed. It has an advanced five-stage filtration system that will effectively filter out all the most harmful contaminants down to a minuscule size of 0.5 microns. This will leave clean, soft drinking water. 

Runner Up – iSpring CU-A4 4-Stage High Capacity Premium Under Sink Drinking Water System

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This is a powerful water filtration system that comes with a high-quality premium chrome faucet (tap).

It’s a comprehensive system with 4 stages, and so is ideally suited for those with particularly problematic water that smells bad or is discoloured.

It is also great for those who require the peace of mind of highly filtered water, e.g. the water in their area is not meeting their expectations. 

As you can see, this is a 4-stage filtration system. Each stage is optimised for differing filtration tasks. The first deals with larger particles above 5 microns.

The second is an ultra-fine filtration membrane, the third uses a special kinetic activated carbon filtration technique and the final stage uses ultra-fine activated carbon. 

Once finished, this filtration system will have filtered out all particles above 0.1 microns, which is very small indeed. It is billed to filter 99% of unwanted contaminants including lead, arsenic, chlorine, microplastics, and much more. 

It’s easy to fit too, and though you’ll need some space, it will still fit under most sinks. There is a smart, high-quality faucet (tap) included (you can use your own too). 


  • Filters media down to 0.1 microns 
  • 4-stage advanced filtering 
  • Lead and BPA-free
  • Comes with faucet (tap)


  • Ultra-fine filtering 
  • High-quality tap included
  • All fittings included
  • Perfect for discoloured or smelly water


  • Fairly large

Bottom Line 

The iSpring CU-A4 4-Stage High Capacity Premium Under Sink Drinking Water System is a powerful, comprehensive option with advanced filtering. It’s an excellent choice for those with problematic water. It even comes with a high-quality faucet (tap). 

Best Budget – Water2Buy Undersink Drinking Water Filter System

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This superb under-sink water filtration system proves that you don’t need to splash your cash to enjoy the benefits of well-filtered water.

At its core, it’s a simple filtration system with a carbon activated filter. Despite its slim price, it’s made in conjunction with the Water Quality Association and is EU-certified for safety. 

As a simple and straightforward under-sink filter, this is very easy to fit and is compatible with the vast majority of sinks in the UK and across the world.

It’s designed to filter all the primary nasties associated with poor-quality, discoloured or smelly water. 

The Water2Buy Undersink Drinking Water Filter System is suitable for water of any quality and will smoothen and filter hard water to enhance its taste. Chlorine, sediment, and volatile organic compounds are all effectively filtered and removed.

Aftermarket parts, including filters that will need to be replaced every 6 months to a year, are readily available. 

The Water2Buy Undersink Drinking Water Filter System is simple and effective. It does its job and will serve anyone looking for a decent budget under-sink filtration system well.

Very easy to install, you can get this up and running and mere minutes and its compact size ensures it’ll fit under most sinks easily, as shown by the demonstration video below.


  • Filters contaminants including heavy metals
  • Certified by the WQA
  • Easy fitting 
  • Compact design


  • Can be fit rapidly without professional assistance
  • Efficient filtering of most contaminants 
  • Compact
  • Excellent price


  • Lacks the teeth of more advanced filtration systems (but still good)

Bottom Line

At a value price, the Water2Buy Undersink Drinking Water Filter System is a straightforward filter system that will fit under almost any sink. Don’t be fooled by its simple design, this is still a high-quality officially certified filter. 

Great Value Alternative – FINERFILTERS Under Sink Drinking Water Tap Filter Kit System

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This great-value system is designed specifically for drinking water only and comes with its own basic faucet (tap).

This is designed to fit beside your typical tap and will require some DIY experience to fit, but the use of a plumber is advised. 

In essence, this is a simple but effective budget system from a company that has particularly good after-sale care. There will be no issue in sourcing replacement filters, parts, or anything else for this under-sink filtration system. 

This is a carbon-activated system designed to remove chlorine, organic contaminants, odours and toxins. It is said to be 97% effective and produces smooth, soft water with much lower chlorine.

The filters last 6 months, depending on water consumption, but they’re cheap and easy to replace.

Remember that this is a water filter for positioning beside your normal faucet (tap), so you’ll need to properly fit the drinking water faucet that is supplied. You should still be able to use your normal tap.

Essentially, this creates an extra tap to sit beside your normal tap. This is a little trickier to fit than some water filters, but it provides added flexibility. 


  • Filters 97% of chlorine, organic contaminants, odours and toxins
  • Fits beside existing taps
  • Comes with faucet
  • 6-month filter life


  • Cheap, great filters
  • Super after-sale care
  • Keeps filtered and normal water separate
  • Compact


  • Requires DIY experience or plumber fitting

Bottom Line

A simple but effective filtration system that will sit beside your normal faucet (tap). The Under Sink Drinking Water Tap Filter Kit System Including Tap and Accessories represents superb value and comes with exceptional after-sale care from a dedicated customer service team.

Well Reviewed – WFM Under Sink Drinking Water Filter System

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For a superior, sophisticated under-sink drinking system, the WFM Under Sink Drinking Water Filter System is very hard to beat.

It has a massive tank with an extremely long-lived filter that won’t need replacing for 3 years. 

This filtration system comes with its own premium tap (faucet). It is designed to fit alongside your existing tap to provide clean drinking water only.

It is reportedly possible to connect it to your main tap, too. The advantage of using it with the supplied tap is to segregate your taps; one for washing up, etc, one for drinking. 

The WFM Under Sink Drinking Water Filter System is clearly a sophisticated system that will filter out organic compounds, heavy metals and chlorine.

The KDF filter uses granular special activated carbon with both filtration and antimicrobial properties, the resulting water is highly filtered, clean, safe and much softer and more pleasant to drink. 

The advantage of the huge filter life is that it’s very much a case of set and forget – simply set it up and you’ll reap the rewards of high-quality filtered water for up to 3 years!


  • KDF filter system
  • Comes with faucet (tap)
  • 3-year filter life
  • Suitable for most sinks


  • Highly sophisticated filtering 
  • Extra-large capacity and filter
  • Long life
  • Comes with everything you’ll need to fit it 


  • None

Bottom Line

This advanced filter will serve you well for the long-term owing to its 3-year extra long-life filter. The special KDF filter performs very well and will effectively filter out all manner of contaminants. The WFM Under Sink Drinking Water Filter System is one of the best home under-sink filters that money can buy. 

Things to Consider When Buying an Under-Sink Water Filter

Filtration Performance

Filtration performance is the aim of the game when it comes to under-sink water filters. 

Some systems use just one single multi-layer filter, shaped like a canister, to achieve their filtering. 

Other systems have multiple stages for advanced filtering. Multi-stage filters are best when you strongly suspect that your water is contaminated. This is possible in rural, cut-off areas, where pipes are low-quality. 

If you simply want filtered water for the taste and health advantages then a single filter system will be fine. If you need more filtration, then invest in a multi-stage filter. 

Filter Life and Cost

No filter lasts forever. After a while, your water filter’s filter components, or filter inserts, will need to be replaced. Some last longer than others.

With some brands, you can buy standard filter replacements that fit any filter system. With others, you’ll need to buy their specific brand filters. 

Size and Ease of Fitting

Under-sink areas differ in size and you’ll need to measure to make sure your filter system will fit. This is most important for larger multi-stage filters, as these will need additional space. 

Another important aspect of under-sink filtration systems is that some work with their own tap (faucet) whereas others can fit to your existing tap (faucet).

Filter systems sometimes come with their own taps. These are connected beside the existing taps in your sink. This will provide you with a dedicated drinking tap. Other systems fit your existing tap instead, meaning that all cold water will be filtered.

It’s worth mentioning that filtration systems work with cold water only. Hot water would damage and denature the filters.  

Why Filter Water?

Water filtering is popular for a reason; it really works and can help improve the quality of water, even when you perceive it to be clean already. 

Filter Heavy Metals

There are a wide variety of reasons why to filter water. Whilst water standards in the UK are generally very good, there is growing scepticism over the content of some heavy metals such as lead, copper and arsenic. Most of these are generally harmless, but some, like lead and arsenic, are not. 

Water filters efficiently filter heavy metals at the point of drinking. Whilst industrial filtering will remove these, they can still pick up additional contaminants on the way from the water plant to your tap – there’s a lot of pipes between the water treatment plant and your house and we don’t really know how well maintained they really are! 

The problem may be worse in rural areas where water piping is possibly old and worn. 

Remove Microplastics and Hormones

Moreover, scepticism is growing around the content of microplastics and hormones in our standard water supply, and there is some doubt as to whether industrial water filtering processes are cut out to deal with this. 

Studies in the UK have actually linked UK wastewater with the feminisation of fish resulting from high oestrogen content in the water, and there are worries that the same applies to our drinking water. The source of these hormones is still a mystery, theories include that they originate from pharmaceutical drugs, excess hormones passed during urination, pesticides or other chemicals. 

Filtering water yourself using newly developed filters provides added security and peace of mind that hormones and other novel contaminants are reduced at the point of use in your house. 

Kidney Stones

Depending on where you live and your water provider, you may have exceptionally hard water. Hard water has high mineral content, particularly magnesium and calcium, and whilst these typically pose little harm and are actually good for us in small quantities, they can contribute to the formation of kidney stones in some individuals.

Water filtering softens water and reduces its mineral content, which lowers the risk. Most filters will not remove all calcium and magnesium as some are good for us, but do get it from other foods in non-sediment form too. 


Last but not least, taste is amongst the top reasons why people invest in water filters. 

Unfiltered water straight from the tap can have a bad taste typically due to chlorine or fluoride. Some people across the UK also report foul-smelling and bad tasting water, and it’s surprisingly common. 

A water filter will filter excess chlorine and other unneeded contaminants and will generally smooth out the taste of water. Many people vastly prefer the taste of filtered water, not just to drink pure, but also in tea and coffee, etc. 


Some excellent under-sink filter systems here. The Waterdrop 10UA Under Sink Water Filter System has become one of the leading options due to its proven five-layer filter, ease of fitting and excellent all-round performance. It rates as the best overall. 

The iSpring CU-A4 4-Stage High Capacity Premium Under Sink Drinking Water System is the most advanced version and is best for suspect water. It has a high-tech four-tier filtration system. 

The Water2Buy Undersink Drinking Water Filter System is a remarkable value choice that shows that under-sink filtration systems need not be expensive. Similar can be said for the FINERFILTERS Under Sink Drinking Water Tap Filter Kit System Including Tap and Accessories and both rate excellent budget choices.

Finally, the WFM Under Sink Drinking Water Filter System is a large, top-class under-sink filter system with a superb long-life filter.