These water filters tackle limescale and make your water taste better
The UK has some of the safest drinking water in the world, with a quality rating of 99.97% according to the Drinking Water Inspectorate. However, it's not perfect, with chemicals sometimes making their way into our water systems.
That's not something to be feared, though. Our water is safe to drink thanks the work of treatment plants and the close monitoring of water quality across the country. That means water filters aren't an essential for UK households. However, if you're not keen on the taste of your tap water and typically prefer bottled, they're still a worthwhile investment.
In particular, water filters and water filter jugs are good for those living in hard water areas. Minerals such as calcium and hydrogen carbonate (both present in hard water) can alter the taste of tap water and lead to the formation of limescale, which can build up on your appliances. Filtering your water removes these impurities by passing it through a sieve-like barrier.
Here at Good Housekeeping, we've done some digging and found a range of water filters to help upgrade your water. Not only will they give you better tasting water but they'll also help save you money if you regularly pick up bottled water in your weekly shop. Check out our top picks below and read on for everything you need to know before shopping.
What chemicals and impurities are in UK tap water?
Remember: UK tap water is of very high quality, so even though there are impurities, these aren't in large enough quantities to harm our health. If you're concerned or think your water might be contaminated, you can check your water quality by contacting your water company and get advice from the Drinking Water Inspectorate.
Certain chemicals and minerals are likely to be in tap water; however – some are found naturally in your supply while others are added to improve the quality. These include the following.
Chlorine
This is typically added to your water supply in very low levels to kill harmful bacteria. Drinking such small amounts is a proven public health safety measure as it kills bacteria like E.Coli, so it's nothing to be concerned about. If you notice an unusual taste or smell of chlorine, it's best to contact your local water company.
Fluoride
Fluoride is naturally present at low levels in most drinking water across the UK. However, it's sometimes added as a measure to prevent tooth decay. Only some water suppliers add fluoride to the supply, and these companies are only allowed to use the chemicals in line with European standards.
Limescale
Limescale build-up is a common problem for those living in hard water areas. When water is heated and evaporates, it leaves behind minerals such as bicarbonate, calcium and magnesium, in the water. These react together and form the chalky white deposit that you'll often find in your kettle, shower head and coffee machines.
Limescale isn't harmful to your health (although it can create an unpleasant taste), but it can affect the efficiency and lifespan of your appliances.
PFAS and Forever Chemicals
PFAS (per-and poly fluoroalkyl substances) are a group of around 5,000 chemicals that are referred to as 'forever chemicals' because of their durability in the environment. These chemicals are used in manufacturing to make cookware non-stick, outdoor clothing water-repellent and cosmetics less greasy.
Studies have recently shown that PFAS can be found in bottled and tap water from around the world. While not much is currently known on the impact of PFAS, the government is working with water suppliers and has restrictions in place on the level of PFAS allowed in our drinking water to ensure tap water supplies remain safe.
Other impurities
Impurities such as lead and nickel can get into tap water if your supply runs through old pipes, particularly those that have been recently disturbed. These impurities are more harmful so you should contact your water supplier if you think there might be some in your tap water.
Should you filter UK tap water?
As water supplies are regulated and consistently checked in the UK, filtering your water isn't essential. However, it can be beneficial if you wish to improve the taste, reduce limescale, and enjoy a fresher supply. Opting for tap water instead of bottled water is also kinder to the environment and your wallet.
UK households throw away an estimated 1.7 billion pieces of plastic weekly, with only 17% of that being recycled. The majority ends up incinerated, a process that releases carbon dioxide into the atmosphere and exacerbates climate change. Instead of buying plastic bottles of water, a more environmentally-friendly option would be to grab a water filter and a reusable water bottle.
How we picked the best water filters
While we haven't tested water filters at the Good Housekeeping Institute in the UK, our sister lab in the US has carried out rigorous testing to find the best water filters for your home. The team of US engineers, chemists, product analysts and home improvement experts tested over 30 water filters, taking into account their capacity, ease of use, instructions and how easy they are to clean.
We have taken their results, reviewed them and verified that the products are identical in the UK, also adding the frequency and cost of replacing filters in the specs.
We've also included some editor's picks in our list, to ensure there are options for different needs and budgets. These have been selected based off thorough research and knowledge of the UK's market leaders when it comes to water filters. The products marked with an "Editor's Choice" badge have been handpicked by our homes experts.
Shop all our best buys below.
3-Stage Max Flow Claryum Under Sink Water Filter System
Aquasana's water filter offers three stages of filtration: a sediment pre-filter, an activated carbon filter that claims to reduce PFAS while retaining minerals like calcium and magnesium, and a catalytic carbon filter that reduces impurities like chlorine.
As an under-sink water filter, some plumbing is required to install it, but it's possible to do without professional help if you're a competent DIY-er. You also need to factor in replacing the filters. The brand claims these last for around six months or roughly 3,600 litres, so you'll be able to enjoy plenty of fresh water before you need to tackle that job.
Marella XL Water Filter Jug
Water jugs are the way to go if you’re on a budget. The pitchers themselves are inexpensive and so are their replacement filters – when compared with under-sink devices.
This BRITA filter has an innovative four-stage system that uses both activated carbon and ion-exchanger pearls to help soften the water while removing impurities.
The drawback with any water jug is that it takes up space in the fridge and needs refilling regularly. Although, with the extra-large design of this one, you get two-litres of filtered water at a time. There's a handy indicator that tells you when to replace the filter, too.
Carafe with Alkaline Mineral Boost VOC Filter
As the name implies, countertop filters are designed to sit on the counter – both a blessing and a curse depending on how much space you have in your kitchen.
But let's get down to the product. Aqua Tru's filter system has four-stage filtration through innovative reverse osmosis technology. This newer type of filter captures contaminants by pushing pressurised water through a semi-permeable membrane, removing impurities like PFAS, fluoride, chlorine and more.
The water is also pushed through a mineral boost filter, which adds in useful minerals like magnesium and calcium. Finally, the water is dispensed into a glass jug that can be stored on the counter or in the fridge.
There's no avoiding the fact that this system is expensive but the filters last longer than most, making the yearly cost of replacing them less than other lower spec filters.
PLUS Large Filtered Water Dispenser
The second countertop filter on our list is ideal for large households that drink a lot of water throughout the day. The Pur Plus holds 30 cups of water, and with its narrow design, it can also live in the fridge, where it will dispense water that's both filtered and cool.
The well-priced dispenser has several added features that make it even better value, like the fact that it's dishwasher-safe for easy cleaning.
The three-stage filtration is also certified to reduce over 20 contaminants, including lead and microplastics. Plus, there's a handy change-filter light and large opening that makes refilling easy.
FM-15A Faucet-Mount Advanced Water Filter
Faucet-mounted filters are another affordable option that deliver pure water straight from the tap without the installation costs of an under-sink unit.
This one is built to filter many contaminants, including lead and chlorine, but you can easily switch from unfiltered to filtered water with a simple pull of a diverter valve where needed.
Keep in mind that the filter is quite bulky, so might be a dealbreaker if you like a clean, streamlined look at the kitchen sink.
Editor's picks
Hub Compact Countertop Water Filter System
The Brita Hub has a sleek design that won't look imposing on your countertop. Set up is simple: just insert the filter, fill the removable reservoir in the back, and plug it in. The filter will then kick into action, reducing the presence of over 70 contaminants.
It uses a carbon filter in its system, which will need changing around every six months, giving you plenty of water to enjoy per filter.
With its tall design, you'll also be able to fit a water bottle underneath.
Purifier
This elegant glass carafe boasts a 10-cup capacity but a fairly compact design, so it won't take up too much room in your fridge or on your counter.
The jug uses an innovative filtering technology with a refillable steel cartridge and filter refill granules. Each portion comes in a bag that contains activated carbon and ion-exchange resin; simply refill the cartridge with granules to help reduce contaminants in your tap water.
The downside? Each filter bag will only last four weeks so you'll need to change the granules and clean the cartridge more regularly than others in this list. It's all dishwasher safe though, so cleaning shouldn't be too much of a hassle.
What to look for when shopping for the best water filter
Type
There are four main options for filtering tap water for drinking.
Jug-style filters are the simplest, most affordable, option, but you need to fill them by hand and they deliver a limited amount of filtered water at a time.
Counter-top filters sit on your counter and typically have a refillable reservoir at the back and a jug that collects the filtered water.
Under-sink filters are integrated into your home's plumbing system, delivering filtered water from a dispenser. They're the most unobtrusive way to get filtered water, but also the most expensive.
Faucet-mounted (or tap-mounted) filters attach directly to the kitchen tap; installation is usually tool-free and DIY-friendly. But they can look clunky and don't work with all taps.
Capacity
For jugs and dispensers that hold water after it’s filtered, pay attention to size and weight. Larger containers mean less refilling, but they're often heavier and take up space in the fridge (if you want chilled water, that is). A countertop model saves space in the fridge and often holds more water, but it requires room on the counter and the water will be room temperature.
With under-the-sink and tap-mounted filters, you don't need to worry about size or capacity because these filter water on demand.
Filtration method
Often, there will be multiple filter types built in to remove various contaminants. These can vary widely too, so always make sure to check that your filter is removing exactly what you need.
Activated carbon is the most common water filter. The carbon-based filter acts like a magnet, absorbing contaminants from the water. Multi-stage filters might also include a pre-filter to remove larger sediment, as well as a second carbon filter to improve odour and taste. If necessary, sometimes there is even a third filter, maybe with an additional carbon block or a mineral booster to add important minerals back into the water.
Reverse osmosis (RO) is a newer type of filter that captures contaminants by pushing pressurised water through a semi-permeable membrane. While extremely effective, it's more expensive and less efficient — many systems require a tank that won't fit under your sink.
Ion exchange is another filtration technique you might hear about. This involves a chemical process where certain minerals and impurities are removed from the water; these typically include minerals that contribute to water hardness such as calcium and magnesium, but can also include heavy metals like lead and mercury.
Mineral booster filters adds minerals like potassium, magnesium and calcium into your tap water. These minerals contribute towards the healthy functioning of the human body so it could be useful to add them back in if you don't get enough minerals in your day-to-day diet.
Filter replacement frequency
Check how often you have to replace the filter. If you dread changing the filter or are prone to forgetting, you may want to look for a long-lasting one.
Whichever water filter you opt for, it’s no good if you don’t change it as recommended. The performance of the water filter depends on the quality of the water source and whether or not the filters are replaced regularly. Some models come with indicators, but if yours doesn’t include one, a slower flow rate or changes in the look and taste of your water are signs that you need to change the filter.
Price
Consider both the upfront price of the water filter and the filter refill costs. A water filter could cost more initially, but the price and frequency of the filter refills may save money over the long term. It's worth calculating the yearly cost of replacements based on the recommended schedule.
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