Best on-tap water filter UK: BRITA vs Waterdrop vs FlowPure
- 9 hours ago
- 6 min read
On-tap water filters are one of the simplest ways to improve the taste of your drinking water without installing a full under-sink system. They attach directly to your kitchen tap and filter water instantly, making them popular with people who want cleaner-tasting water without the hassle of refillable filter jugs.
But not all tap filters are the same. Some focus mainly on improving taste, while others claim to reduce a wider range of contaminants. Build quality, filter lifespan and ongoing costs can also vary.
To help you decide which option might suit your kitchen, we compared three popular models:
We looked at the specifications, filter technology, running costs and — importantly — real customer feedback to understand how these filters perform in everyday homes.
Quick verdict
Best Quality Water: FlowPure
The widest range of contaminant reduction 150+ and uses a fine 0.1-micron ceramic stage.
Best Overall Value: Waterdrop
A solid all-round option, good taste improvement and the lowest ongoing filter cost.
Best Basic Brand-Name: BRITA On Tap V
A familiar brand and straightforward tap filter, but check tap compatibility before buying.
Comparison BRITA vs Waterdrop vs FlowPure
Feature | BRITA On Tap V | Waterdrop WD-FC-06 Stainless Steel | FlowPure Stainless Steel |
Build material | Plastic | Food-grade 304 stainless steel | Medical-grade 301 stainless steel |
Filter lifespan | 600L / 4 months | 1200L / 3 months | 2–3 months |
Micron rating | 0.6 micron | Not specified | 0.1 micron |
Certifications | NSF certified | NSF/ANSI 42 | NSF 42 |
Effective on fluoride | No | No | Yes |
Effective on limescale | No | No | Yes |
First-year cost | £75.50 | £72.99 | £89.96 |
Ongoing annual cost | £58.50 | £49.32 | £89.96 |
Subscription option | No | No | Yes |
Available from |
*All prices and specifications correct at time of publishing
One thing worth noting up front: none of these filters are designed to soften hard water. They improve drinking water quality but won’t remove calcium and magnesium — the minerals that cause limescale.
However, some people find that limescale build-up appears to happen more slowly when using certain tap filters. This is likely because some filtration media can influence how the minerals behave in the water, sometimes causing them to form softer, less sticky crystals rather than hard scale that clings to surfaces.
BRITA On Tap V Water Filter System Review
BRITA is one of the best-known water filtration brands in the UK, largely thanks to its filter jugs. The On Tap V system brings the same idea directly to your kitchen tap.
The filter uses a four-stage filtration system designed to reduce substances that affect taste and odour, including chlorine, as well as particles larger than 0.6 microns and certain metals such as lead and copper.
The housing is made of plastic, which is fairly typical for tap filters but may concern people who prefer to avoid plastic.
BRITA is also clear that the system does not remove limescale, so it won’t prevent scale build-up in kettles or appliances in hard water areas.
What the reviews tell us
The product currently holds an average rating of around 4.2 stars on Amazon. When we looked through recent reviews, the majority were positive, with many users mentioning improved taste and simple installation.
However, a notable number of lower-rated reviews mentioned compatibility issues with UK taps. In practice, this means some households may find the filter doesn’t fit their tap properly, depending on the aerator thread.
If you do decide to try it, buying through Amazon or another retailer with a straightforward return policy is sensible.
Cost
The Brita filter option comes in middle of the pack.
First year: £75.50
Ongoing annual: £58.50 (for recommended 3 filters per year)
Best for
Households who prefer a familiar brand
Buyers looking for a simple tap filter and taste improvement
Homes that use less water
Not ideal for
People wanting strong filtration performance
Homes with unusual or non-standard taps
Buyers looking to avoid plastic
Those concerned with fluoride / limescale
Waterdrop WD-FC-06 Stainless Steel Tap Filter Review
The Waterdrop filter uses food-grade 304 stainless steel housing, which many buyers prefer for durability and aesthetics.
Inside, the filter uses a carbon block filtration system combined with mesh and PP cotton layers to reduce chlorine, taste and odour while filtering certain particles from tap water.
One advantage here is the larger filter capacity. Waterdrop states the cartridge can treat up to 1200 litres of water, roughly double the capacity of the BRITA system.
What the reviews tell us
The Waterdrop filter currently holds around a 4.4-star rating on Amazon. After reviewing recent feedback, the majority of users reported positive experiences, particularly mentioning:
Easy installation
Improved taste
Strong water flow
The small number of negative reviews typically mentioned installation issues if the seal wasn’t fitted correctly, occasional leaks, or difficulty fitting certain taps.
Overall, the feedback suggests most users find the filter simple to install and effective at improving drinking water taste.
Cost
The Waterdrop is our best value option.
First year: £72.99
Ongoing annual: £49.32 (for recommended 4 filters per year)
Best for
Homes wanting low ongoing costs (£49 per year)
Households with higher water use (1200L)
People who prefer stainless steel instead of plastic
Not ideal for
Buyers wanting very fine filtration
Those concerned with fluoride / limescale
FlowPure Stainless Steel Tap Filter Review
FlowPure positions itself as a more advanced tap filtration system, using a multi-stage design that includes activated carbon, activated alumina and a ceramic filtration layer.
The ceramic stage is claimed to filter down to 0.1 microns, which is significantly finer than the BRITA system.
The company states the filter can reduce 150+ substances, including: lead, chlorine, microplastics and nanoplastics, PFAS and other “forever chemicals”, THMs (trihalomethanes), bacteria and viruses, arsenic, selenium and pesticides.
It’s also the only filter of the three that claims to reduce excess fluoride, and it mentions it's also effective on limescale.
The system uses stainless steel housing, and buyers can either make a one-off purchase or subscribe for replacement filters.
Because tap filters gradually collect contaminants over time, regular cartridge replacement is important, so some households may find a subscription convenient.
What customers say
The FlowPure filter has a 4.8-star rating on the brand’s website. In recent reviews, most customers reported being very happy with their purchase, often mentioning better-tasting water and straightforward installation.
The only negative review in the sample mentioned feeling overwhelmed by the number of adaptors included, rather than any issue with the filtration itself.
Cost
FlowPure comes in the more expensive option, reflecting the filter’s finer filtration.
First year: £89.96
Ongoing annual: £89.96 (for recommended 4 filters per year)
Best for
Buyers who want maximum filtration
Those concerned with fluoride / limescale
People who find subscriptions convenient (none subscription basis also available)
Not ideal for
Budget-conscious buyers
Which on-tap water filter should you choose?
Each of these filters suits a slightly different type of household.
The BRITA On Tap V is a simple, familiar option that can improve drinking water taste, although the compatibility issues mentioned in some reviews mean it may not fit every UK tap.
The Waterdrop stainless steel filter offers strong value thanks to its longer filter capacity, lower ongoing costs and stainless steel housing.
The FlowPure filter is aimed at buyers who want the most advanced filtration system and are happy to pay a higher price for it.
In practice, all three products focus primarily on improving drinking water quality, so the best choice usually comes down to budget, build material and filtration preferences.
Do on-tap filters remove limescale?
A common question people ask is whether tap filters can reduce hard water or stop limescale forming in kettles. The short answer is no — they don’t soften the water.
Most tap filters are designed to improve drinking water quality by reducing substances like chlorine, certain metals and particles that affect taste or smell.
Hard water minerals — mainly calcium and magnesium — are usually left in the water, which means limescale can still form in appliances.
However, some filters may slightly change how those minerals crystallise when heated, which can slow the rate of visible scale build-up or make deposits less sticky. This can make kettles appear cleaner for longer, even though the hardness minerals are still present.
Of the three filter reviewed the FlowPure is the only one to state it's effective on limescale, so if this is a concern for you, that's the option to go for.
What actually removes limescale from tap water?
If you want to stop limescale at the source, there are two main options:
Water softeners
These systems remove calcium and magnesium from the water supply using ion exchange. This is the most effective way to eliminate limescale in the home.
Reverse osmosis systems
These filters remove a wide range of dissolved minerals, including those responsible for hardness, although they’re usually installed under the sink rather than on the tap.
All product specifications, pricing and review ratings correct at 4 March 2026.
Author bio: Lucinda Smalley is the founder of Hard Water Home, a UK-based consumer site helping households in hard water areas understand the challenges and solutions more easily — and make smarter choices for their health and homes. Based in Poole, she also co-runs an award-winning plumbing company, giving her first-hand insight into how water quality affects everything from appliances to skin and hair. When she’s not writing, she’s happiest at the beach with her family and a good cup of coffee (minus the floaty bits!). More about us ➡