A good water filter jug cuts limescale, chlorine, and other impurities from UK tap water, and the 3.5L models here can handle a family of four without constant refilling. Prices range from £12.99 for a six-pack of replacement cartridges to £43.88 for a year's supply of BRITA originals, so there is a sensible option at every budget.
What to look for
01Jug capacity and how often you will refill it
Most filter jugs sold in the UK fall into two size bands: around 2. 5L and around 3.5L. A 2.5L jug holds roughly 1.5L of filtered water once the reservoir is accounted for, which is fine for one or two people but means constant trips to the tap for a family. A 3.5L jug such as the BRITA Marella XL delivers closer to 2.5L of ready-to-drink water, cutting refills by about 40 per cent. If your fridge shelf is tight, measure before you buy: the Marella XL is designed to fit a standard 600mm-wide fridge door shelf, but check depth clearance too. The Waterdrop Elfin and Aqua Optima Liscia are both labelled fridge-friendly at 2.5L, making them better for smaller households or under-counter fridges.
02Filter lifespan and running cost per litre
Cartridge lifespan is quoted in litres filtered or weeks of use, whichever comes first. BRITA MAXTRA PRO cartridges are rated for 150L or four weeks, so a family drinking 2L a day will replace them roughly every five weeks. At £43.88 for 12 cartridges (about £3.66 each), that works out to around 2.4p per litre. FilterLogic's compatible six-pack at £12.99 (£2.17 per cartridge) drops that to roughly 1.4p per litre, a meaningful saving over a year. Note that BRITA's own MAXTRA PRO Pure Performance cartridges also reduce PFAS and pesticides, which the compatible alternatives do not claim. If you live in a hard-water area such as London, the South East, or the East Midlands, consider the BRITA MAXTRA PRO Limescale Expert variant, which prioritises scale reduction to protect kettles and coffee machines on the UK's 240V mains.
03Filtration claims and certifications
Not all filter jugs remove the same contaminants. Look for NSF certification (the Waterdrop Elfin carries this) or independent lab data rather than vague marketing language. BRITA MAXTRA PRO Pure Performance is tested to reduce chlorine, limescale, heavy metals, PFAS, and pesticides. The Aqua Optima Evolve+ cartridges focus on chlorine, limescale, and general impurities. If fluoride reduction matters to you, the Waterdrop Elfin explicitly lists fluoride on its claims, which is unusual at this price point. BPA-free construction is now standard across all picks here, but it is worth confirming if you are buying for young children. Hard-water households in particular benefit from a limescale-specific cartridge, as scale build-up shortens the life of kettles and coffee machines significantly.
04Replacement cartridge availability and lock-in
Before committing to a jug, check that replacement cartridges are easy to source. BRITA's MAXTRA+ and MAXTRA PRO format is the most widely stocked in the UK, available from Tesco, Argos, Amazon, and most supermarkets. This also means a large compatible-cartridge market, with brands such as FilterLogic and Aqua Optima's Evolve+ offering lower-cost alternatives. Aqua Optima jugs use the Evolve+ cartridge, which is less universally stocked but available online. Waterdrop's WD-PF-01A Plus replacement is currently Amazon-only in the UK, so factor that in if you prefer to shop in-store. Buying a starter bundle that includes three or six cartridges, as several picks here do, reduces the per-cartridge cost and means you are not caught short after the first four weeks.
Our top picks
Best for large families who refill frequentlyBRITA Marella XL Water Filter Jug
At £25.99 with one MAXTRA PRO Pure Performance cartridge included, the BRITA Marella XL offers a 3.5L capacity that suits a busy household. The digital filter-change indicator removes the guesswork, and the flip lid lets you top up without removing the whole lid. It is designed to sit on a standard 600mm fridge shelf. The 90-day low was £15.00, so watch for a price drop before buying.
Best for renters and small kitchensWaterdrop Elfin Fridge Water Filter Jug
The Waterdrop Elfin costs £19.99 but has dropped to £12.59 in the past 90 days, making it one of the most affordable NSF-certified jugs available in the UK. Its 2.5L BPA-free body fits neatly in a fridge door, and it explicitly reduces fluoride and chlorine. With over 15,000 reviews and a 4.6-star average, it punches well above its price bracket for a single person or couple.
Best for households wanting PFAS and pesticide reductionBRITA MAXTRA PRO Pure Performance Water
BRITA's MAXTRA PRO Pure Performance 12-pack costs £43.88 (around £3.66 per cartridge) and covers roughly a year's supply for one jug. These are the only cartridges here tested to reduce PFAS alongside chlorine, limescale, and pesticides. The 4.8-star rating across 10,135 reviews reflects consistent performance. If you already own a BRITA jug, this is the straightforward upgrade to the most comprehensive filtration BRITA offers.
Best value compatible cartridges for BRITA jug ownersFilterLogic Universal 6 Pack Filter Cartridges
FilterLogic's six-pack at £12.99 (£2.17 per cartridge) is compatible with BRITA Maxtra+, MAXTRA PRO, Marella, and Elemaris jugs, as well as Bosch Tassimo machines. The price has held steady at £12.99 for 90 days, so there is no need to wait for a sale. With 15,275 reviews at 4.4 stars, it is the most-reviewed filter cartridge on this list and a reliable everyday choice for hard-water areas.
Best starter bundle for first-time filter jug buyersAqua Optima Liscia Water Filter Jug
The Aqua Optima Liscia with three Evolve+ cartridges costs £14.99 and has hit a 90-day low of £9.00, making it the cheapest complete jug-and-filter bundle here. The 2.5L dishwasher-safe body is easy to clean, and the easy-fill lid suits those who find narrow-necked jugs fiddly. It reduces limescale and chlorine, which covers the main concerns for most UK tap water.
Best for protecting kettles and appliances in hard-water areasBRITA MAXTRA PRO Limescale Expert Water
BRITA's MAXTRA PRO Limescale Expert three-pack costs £13.95 and is specifically formulated to reduce scale build-up, making it the sensible choice if you live in London, the South East, or the East Midlands. At 4.7 stars from nearly 8,000 reviews, it is well-regarded. The 90-day low of £8.99 suggests it goes on sale regularly, so adding it to a price-alert list is worthwhile before buying.
Frequently asked
How often should I change my water filter cartridge in the UK?
Most cartridges sold in the UK are rated for 150 litres or four weeks, whichever comes first. A family of four drinking around 2 litres of filtered water per day will typically need a new cartridge every five to six weeks. In hard-water areas such as London or the South East, limescale clogs cartridges faster, so you may need to replace them closer to the four-week mark. Many BRITA jugs include a digital indicator that tracks usage automatically.
Are compatible filter cartridges as good as BRITA originals?
Compatible cartridges such as FilterLogic reduce chlorine and limescale effectively for everyday use, and independent reviews suggest performance is broadly similar for those two contaminants. However, BRITA's own MAXTRA PRO Pure Performance cartridges are additionally tested to reduce PFAS, pesticides, and heavy metals, which most compatible alternatives do not claim. If your main concern is taste and limescale, a compatible cartridge at around £2.17 each is a reasonable saving. If you want the broadest filtration, stick with BRITA originals.
What size water filter jug fits in a standard UK fridge?
Most UK fridge door shelves are 600mm wide and around 100 to 120mm deep. A 2.5L jug such as the Waterdrop Elfin or Aqua Optima Liscia fits comfortably on most door shelves. The BRITA Marella XL at 3.5L is designed to fit a standard fridge shelf but is taller and wider, so measure your shelf depth before buying. Slim-profile jugs are labelled fridge-friendly on their product pages, which is a useful filter when searching.
Does a water filter jug remove fluoride from UK tap water?
Most standard filter jugs do not remove fluoride. The Waterdrop Elfin is one of the few jugs at this price point that explicitly claims fluoride reduction, backed by NSF certification. BRITA's MAXTRA PRO cartridges do not list fluoride as a target contaminant. If fluoride removal is a priority, check the cartridge's published test data rather than relying on general filtration claims. Fluoride levels in UK tap water are generally low and within safe limits set by the Drinking Water Inspectorate.
Is it cheaper to buy filter cartridges in bulk?
Yes, buying in larger packs reduces the per-cartridge cost noticeably. A BRITA MAXTRA PRO 12-pack at £43.88 works out to £3.66 per cartridge, compared to around £4.65 each if bought in a three-pack. FilterLogic's six-pack at £12.99 brings the cost down to £2.17 per cartridge. The Aqua Optima Liscia bundle with six cartridges at £22.00 costs £3.67 per cartridge including the jug itself. Buying a six-month supply at once also means fewer reorder reminders.