For most UK households, a jug filter is the simplest way to cut chlorine, limescale, and PFAS from tap water without any plumbing. The market splits into two main types: countertop jugs and tap-mounted units. This guide covers eight products across both cartridges and complete jugs, so you can pick the right format for your kitchen and water hardness.
What to look for
01Jug capacity and fridge fit
Jug filters come in two practical sizes for UK kitchens: around 2. 4 L and 3.5 L. A 2.4 L jug (such as the BRITA Marella or AQUAPHOR Compact) fits neatly in most fridge doors, which typically accommodate containers up to about 30 cm tall. The BRITA Marella XL steps up to a larger reservoir, useful if you boil a full 1.7 L kettle multiple times a day or have a household of four or more. Bear in mind that the total jug volume includes the upper reservoir, so the ready-to-drink capacity is usually 200-400 ml less than the headline figure. If your fridge shelf is tight, measure the door shelf depth before buying: most standard UK fridge doors have a shelf around 10-12 cm deep, which suits slim-profile jugs but can be awkward for wider XL models.
02Cartridge compatibility and filter lifespan
The cartridge ecosystem matters as much as the jug itself. BRITA's MAXTRA+ and MAXTRA PRO formats are the most widely supported in the UK, meaning third-party cartridges such as FilterLogic FL402H are drop-in compatible. BRITA's own MAXTRA PRO Pure Performance cartridges are designed to filter up to 150 litres per cartridge, which works out to roughly four weeks for a typical two-person household. The MAXTRA PRO Limescale Expert variant uses a higher proportion of ion-exchange resin, making it the better choice if you live in a hard-water area (broadly, anywhere south and east of a line from the Severn to the Humber). AQUAPHOR's Maxfor+ cartridge uses a different proprietary format, so you are locked into AQUAPHOR replacements. Always check whether a jug uses a proprietary or open standard before committing, as cartridge costs accumulate quickly over a year.
03Filtration scope: what each filter actually removes
Not all cartridges filter the same contaminants. The BRITA MAXTRA PRO Pure Performance is certified to reduce chlorine, PFAS (per- and polyfluoroalkyl substances), pesticides, and limescale, making it one of the broader-spectrum options in this price bracket. NSF certification is the benchmark to look for: the Waterdrop PT-05B Elfin carries NSF certification, which means its performance claims have been independently verified against a defined standard rather than being self-declared. If your main concern is limescale (common in London, the South East, and East Anglia), the BRITA MAXTRA PRO Limescale Expert concentrates its ion-exchange capacity on calcium and magnesium reduction. If you want broader chemical reduction including PFAS, opt for the Pure Performance variant instead. Knowing your local water hardness (available free from your water company's website) helps you choose the right cartridge chemistry.
04Cartridge throughput and replacement frequency
Cartridge throughput is measured in litres filtered, not weeks elapsed, though manufacturers quote weeks as a convenience guide. A household that drinks two litres of filtered water per day will exhaust a 150 L cartridge in about 75 days. Buying in multipacks reduces the per-cartridge cost significantly: the BRITA MAXTRA PRO Pure Performance 12-pack spreads the cost across a full year for most households, while the 6-pack Limescale Expert suits those who want to reassess cartridge type mid-year. FilterLogic's 6-pack of MAXTRA+-compatible cartridges offers a cost-effective alternative if Pure Performance-level PFAS reduction is not a priority. The AQUAPHOR Compact ships with one Maxfor+ cartridge included, so factor in the ongoing replacement cost before comparing headline jug prices.
05Countertop footprint and ease of filling
On a UK worktop, space is often at a premium, particularly in galley kitchens where 600 mm base units are standard. A 2.4 L jug typically has a footprint of around 11 cm x 23 cm, small enough to sit beside a kettle without blocking a socket. The Waterdrop PT-05B Elfin is notably compact at 2.5 L, designed to sit inside a fridge rather than on the worktop. Filling mechanism also varies: some jugs have a flip-top lid that allows one-handed filling under a tap, while others require removing the lid entirely. If you fill your jug directly from a UK mixer tap with a low spout, check the jug's opening diameter before buying, as some narrow-neck designs can be fiddly to fill without splashing.
Our top picks
Best for everyday households wanting a complete starter kitBRITA Water Filter Jug MAXTRA Marella
The BRITA Marella bundles three MAXTRA PRO Pure Performance cartridges with the jug, covering roughly three months of use for a two-person household straight out of the box. Its 2.4 L capacity fits standard UK fridge door shelves, and the Pure Performance cartridge is certified to reduce chlorine, PFAS, pesticides, and limescale. The slim profile keeps it manageable on a 600 mm worktop beside the kettle.
Best for larger households or heavy kettle usersBRITA Water Filter Jug MAXTRA Marella
The BRITA Marella XL steps up to a larger reservoir, meaning fewer refill trips for households that boil a full 1.7 L kettle repeatedly throughout the day. It ships with one MAXTRA PRO Pure Performance cartridge and uses the same MAXTRA PRO format, so you can switch to the Limescale Expert variant if you live in a hard-water area such as London or the South East.
Best compact fridge-friendly jugWaterdrop PT-05B Elfin Water Filter Jug
The Waterdrop PT-05B Elfin holds 2.5 L and carries NSF certification, meaning its filtration claims are independently verified rather than self-declared. Its slim design is engineered to sit inside a fridge rather than on the worktop, freeing up counter space in smaller UK kitchens. The 3-month cartridge lifespan suits light-to-moderate use, and the blue colourway is a practical indicator of the filter type installed.
Best budget entry point for first-time jug filter buyersAQUAPHOR Water Filter Jug Compact Grey
The AQUAPHOR Compact arrives ready to use with one Maxfor+ cartridge included, at the lowest entry price in this group. Its 2.4 L capacity matches the BRITA Marella's fridge-door footprint. The Maxfor+ uses a multi-layer filtration medium. Note that replacement cartridges use AQUAPHOR's proprietary format, so factor that into your long-term cost calculation before committing.
Best value cartridge multipack for BRITA jug ownersBRITA MAXTRA PRO Pure Performance Water
The BRITA MAXTRA PRO Pure Performance 12-pack is the most cost-efficient way to keep a BRITA jug running for a full year. Each cartridge is certified to reduce chlorine, PFAS, pesticides, and limescale, covering the broadest contaminant range in the MAXTRA PRO range. Buying 12 at once eliminates the risk of running out and reverting to unfiltered tap water mid-month.
Best cartridge for hard-water areasBRITA Water Filter Cartridge MAXTRA PRO
The BRITA MAXTRA PRO Limescale Expert 6-pack concentrates its ion-exchange resin on calcium and magnesium reduction, making it the targeted choice for households in hard-water zones such as London, the South East, and East Anglia. Six cartridges cover roughly six months for a two-person household. The format is compatible with all current BRITA MAXTRA PRO jugs, including the Marella and Marella XL.
Best third-party alternative to BRITA own-brand cartridgesFilterLogic FL402H | 6X Filter Cartridge
FilterLogic's FL402H cartridges are drop-in compatible with BRITA MAXTRA+ and MAXTRA PRO jugs, using the same physical format. The 6-pack format provides roughly six months of supply for a two-person household. If PFAS and pesticide reduction are not your primary concern and you mainly want chlorine and limescale reduction, this is a practical way to maintain your existing BRITA jug at a lower ongoing cost.
Frequently asked
How often should I replace my water filter cartridge?
Cartridge lifespan is determined by the volume of water filtered, not simply the number of days elapsed. Most BRITA MAXTRA PRO cartridges are designed to filter up to 150 litres before the filtration medium is exhausted. For a two-person household drinking roughly two litres of filtered water per day, that works out to approximately 75 days. A four-person household will exhaust the same cartridge in around 37 days. BRITA jugs include an electronic indicator that tracks usage; if yours does not, mark the installation date on the cartridge and replace it when the volume threshold is reached.
Are third-party filter cartridges as good as BRITA originals?
Third-party cartridges such as FilterLogic FL402H are physically compatible with BRITA MAXTRA+ and MAXTRA PRO jugs and will reduce chlorine and limescale. The key difference is filtration scope: BRITA's own MAXTRA PRO Pure Performance cartridges are certified to reduce PFAS and pesticides in addition to chlorine and limescale, a claim that requires independent verification to make. If PFAS reduction matters to you (for example, if your local water company has flagged elevated PFAS levels), stick with the certified original. For straightforward chlorine and limescale reduction, a compatible third-party cartridge is a reasonable alternative.
Which water filter is best for hard-water areas in the UK?
If you live in a hard-water area (broadly, London, the South East, East Anglia, and parts of the Midlands), choose a cartridge with a high proportion of ion-exchange resin, which binds calcium and magnesium ions responsible for limescale. The BRITA MAXTRA PRO Limescale Expert is specifically formulated for this purpose and is available in 3-pack and 6-pack formats. You can confirm your local water hardness for free on your water company's website; anything above 200 mg/L as calcium carbonate is classified as hard water by UK standards.
What does NSF certification mean on a water filter?
NSF International is an independent body that tests water treatment products against defined performance standards. When a filter carries NSF certification, it means an external laboratory has verified that the product reduces the contaminants listed on its packaging to the levels claimed, under controlled test conditions. This is distinct from a manufacturer's self-declared performance figures, which are not independently verified. The Waterdrop PT-05B Elfin carries NSF certification. When comparing filters, NSF certification provides a more reliable basis for comparing filtration performance than marketing copy alone.
Can I put a water filter jug in the fridge?
Yes, and for most households it is the recommended storage method. Keeping filtered water cold slows bacterial growth in the jug and means you always have chilled water ready for drinking or for filling a kettle. Check the jug's dimensions against your fridge door shelf before buying: most standard UK fridge door shelves are around 10-12 cm deep and 30 cm tall. The AQUAPHOR Compact (2.4 L) and BRITA Marella (2.4 L) are both designed to fit standard fridge door shelves. The Waterdrop PT-05B Elfin is specifically designed for fridge storage with a slim profile.