Let\u2019s start this article off by explaining what an under sink water filter is - and you won\u2019t be surprised to know that the name gives you most of the answer! But there is a little more to it than that and it is important to understand what they are before considering whether one is right for you. These filters sit underneath the sink and are connected to the cold water pipe, taking water into a tube and passes it through the filter, up to a special faucet. This happens on-demand and doesn\u2019t use a tank, and so reduces waste and improves energy efficiencies. Its faucet is separate to the standard ones on your sink, allowing you to use unfiltered water whenever you need to, such as for water plants. These under sink water filters are getting more and more efficient all the time and now offer similar levels of contaminant removal to what reverse osmosis systems do, which wasn\u2019t something you could say a few years ago. Our Top Picks Best Under Sink Filters of 2020: Under Sink Filters that are worth mentioning: Our Top 8 Under Sink Water Filters We\u2019ve taken the time to put together a list of our eight favourites under sink water filters so that you can choose from the best on the market. Please see below a brief description and review of each product, including why we believe they are a great choice for any household. 1. CuZn UC-200 Under Counter Water Filter The CuZn UC-200 gets one of the strongest reviews from our team of experts for a few reasons. For a start, it's an affordable piece of kit that filters water to the level you would expect, ensuring you have a safe, clean and great tasting water supply. Furthermore, installation is simple, connecting it to the cold water line under your sink, with everything you need arriving in the box. Where this model does stand out from the crowd is its long-lasting filter, which can work for up to 50,000 gallons of water, a phenomenal amount compared to many others on the market. Obviously, to perform this well there are downsides and with this one, the main issue is size - it is a bit bigger than other models, so may not be suitable for very small cupboards. 2. iSpring US31 3-stage Under Sink Water Filtration System We start off from one of the leading filter manufacturers, iSpring and their 3-stage under sink water filter system. It has one sediment and two carbon block filters which will stop harmful contaminants from getting through into your water supply. It comes with a reasonable faucet that wouldn\u2019t look out of place in most kitchens and can be installed at home without the need for professional support. You can even use a different faucet if you want to which is a big bonus for this product. Away from the fantastic filter, it does suffer from a relatively low flow rate, only 1 GPM, which may be too slow for some people and this is part of the issue with on-demand filtration, as it must actively filter as you run the water. 3. Clearly Filtered Kitchen Faucet Filtration System A fantastic solution from ClearlyFiltered makes it onto our list for the primary reason that this is so quick and easy to install and yet still filters like the best on the market. You simply connect the water lines and it's ready to go, however, it is important to note because of this ease of use, it doesn\u2019t have a bypass valve, so when you turn the cold water on, you will use the filter. As a filter system, it performs well, removing well over 200 contaminants from the water supply including chlorine, meaning you get great smelling and tasting water, as well as safe and healthy water. The filter lasts about 1 year depending on your usage and you can connect this filter to your existing faucet because it connects straight to the water lines. 4. Waterdrop 15UA Under Sink Water Filter System One of the more affordable models on our list, a lot of care and attention has been put into the design of this under sink water filter because it only has one part, compared to others having multiple cartridges. This doesn\u2019t mean it lacks any of the filtration power, as it has a 5-stage system that removes metals and fluorides, as well as an activated carbon block improving taste, smell and safety of the water. This model utilises your existing faucet if you\u2019d prefer and doesn\u2019t require any kind of electricity connection, so can be used in remote or off-grid settings. The filter lasts around two years depending on usage and is relatively cheap to buy. However, what we have found is that these filters cannot be used with hot water and should you wish to use a separate faucet, you would need to buy one separately, potentially adding to the cost. 5. Aquasana AQ-5300.55 3-Stage Under Sink Water Filter We know this model is at the lower end of the price range but we have included it before despite its price, it is still a quality filter, often producing clean and great tasting water as well as more expensive models. It will remove the majority of harmful bacteria and metals from your water supply and only takes a few moments to install, letting you start getting clean water almost immediately. With an attractive faucet arriving as standard, the option to choose a different one when you order and an incredibly easy to change the filter (you simply twist it out and twist a new one back in), there isn\u2019t much to dislike here. 6. APEC WFS-1000 3 Stage Under Sink Water Filter A popular product in the under sink water filter market is up next, with APEC producing a 3-stage filtration system that gives your household high rated, clean and healthy water that will also taste amazing. It is also important to note that this one doesn\u2019t impact on the water pressure, a concern for many looking at water filters as any on-demand water filter will generally reduce the flow. Not the case here, with feedback suggesting you don\u2019t suffer from low pressure. In terms of installation, you won\u2019t struggle with this, everything needed arrives in the box, ready with pre-drilled holes so you can mount it on the wall easily enough. Unfortunately, you can only get the one style of faucet with this model, so for those wanting a specific design or finish, you may be disappointed. 7. Doulton W9330958 SuperCarb Under Sink Water Filter This model from Doulton uses a complex four-stage filter process to really provide the highest quality water that is clean, safe and attractive to drink. The first stage uses a carbon block filter to focus on bacteria, odours and taste, followed by a second antibacterial filter. After this phase, they have another carbon filter which this time removes chlorine and then a fourth filter aimed at preventing metals from getting into the water supply. An effective system that is well made and will last longer than the majority of under sink water filters on the market, but you may need to buy extra parts to install it correctly, not something we particularly like, but it is a fantastic filter. 8. Filtrete Advanced Under Sink Water Filtration System We\u2019ve included this filter on our list because it is incredibly cost-effective and so for those on a budget, you can still get clean and healthy water. It doesn\u2019t use a separate faucet, you simply connect it to the cold water supply and any water you use will have to pass through the filter system. Don\u2019t mistake cheap for poor results, as you will still remove up to 99.99% of sediments in the water and 96.6% of odours and more. As you\u2019d expect from a simple product, installation isn\u2019t an issue, taking less than 30 minutes for most and the filters should last on average around 6 months, or 10,000 gallons of water, depending on how heavy the water usage is in your household. Summary Under sink water filters are a fantastic choice for anyone wanting to get filtered water at a specific sink in your house, but perhaps lack the space for larger tanks or whole-house systems. You will get high quality, clean and safe water for your family and a reasonable price, making these a great investment over the long term. Why do you need one? There are a few reasons why choosing an under sink water filter is the right choice for anyone wanting a filter system in their household. Firstly, these can be used in small spaces due to the lack of a water tank and so are perfect for those with limited space, such as a flat. Secondly, choosing one of these filters is generally a cost-effective solution because the upfront costs are relatively low and so are the maintenance fees because filters aren\u2019t expensive. Aside from the space and financial implications, the flexibility that these filters bring means that you can promote drinking more water in your household, an important part of a healthy lifestyle and choose when to use filtered water or not. We firmly believe that reducing waste and damage to the environment should be at the forefront of decision making and with an under sink water filter, you remove wastewater, stop buying countless single-use plastic bottles and can choose when to use filtered water. Every aspect helps reduce the impact your water supply as on the environment. The pros and cons With so many types of water filtration systems out there, it is important to understand the pros of choosing an under sink water filter and why they may not necessarily be the best choice for your specific situation. Pros Let\u2019s start off with all of the reasons why an under sink water filter system would be a great choice for you. Quality and Taste The obvious place to start is that this type of filter system will offer you higher quality water, without the contaminants and harmful bacteria that even modern tap water can contain. Particularly important in the kitchen, where your family will drink the water, use it to cook with and give to pets, you want to make sure this water outlet provides only the safest, healthier water. Not only improved quality, but the improved taste comes as a result of choosing an under sink water filter, helping to remove those smells and tastes that put people off drinking water. By making it more appealing, you will help your household drink more water and live a healthier lifestyle. Environmental Impact This type of filter reduces the impact on the environment in a few different ways, starting with minimal waste due to not using a water tank. As the water is filtered on-demand, you won\u2019t have any wastewater being sent back, reducing water usage. Furthermore, you won\u2019t need to buy bottles of mineral water at the shops because you can refill your bottle at home with clean, refreshing water. Space Saving There are no big storage requirements with an under sink water filter, as it doesn\u2019t have a tank. This means it will fit in more modest properties, hidden away under the sink. As it doesn\u2019t filter the entire household, you don\u2019t need large pieces of equipment. Money-Saving These filters are relatively inexpensive to purchase and maintain due to cheap filters and easy maintenance. Add in the fact that they can be installed at home without professional help and you\u2019ve got a great solution at a budget-friendly price. Cons There are not many cons to choosing an under sink water filter but it is important to be aware of the limitations, in case they form part of your original reason for purchasing a filter system. Only for single outlets These filters are designed to fit under the sink of a specific outlet, such as the kitchen sink and not offer a whole house water filter solution. This may be okay for many of us but for those who want to have filtered water in multiple locations, you would either need multiple versions of this or another whole house system. Requires a separate tap An under sink water filter has its own faucet for the clean filtered water it provides, which may put people off. There are ways around this, such as getting a three-way tap installed that is connected to the other water connections.