A decent water filter jug costs as little as £11.24 in the UK, yet the right choice depends on your water hardness, fridge dimensions, and how often you want to swap cartridges. This guide covers eight products across jugs and replacement filters, so you can stop buying bottled water and start drinking better tap water straight away.
What to look for
01Jug capacity and fridge fit
Most UK fridge doors have a shelf depth of around 100–120mm, which rules out wider jugs immediately. The 2.5L models from Waterdrop and Aqua Optima are designed to be fridge-friendly and slim enough to sit upright on a standard door shelf. The BRITA Marella XL steps up to 3.5L, which is useful if you fill the kettle several times a day, but measure your fridge shelf before buying — a jug that won't fit is useless. Capacity also affects how often you refill: a 2.5L jug holds roughly 10 mugs of tea, so a two-person household might refill it twice daily. If you entertain regularly or have a family of four, the 3.5L BRITA is worth the extra few centimetres.
02Filtration performance and what it actually removes
Not all filters tackle the same contaminants. In hard-water areas — which covers most of southern England and the Midlands — limescale reduction is the priority, and the BRITA MAXTRA PRO Limescale Expert cartridges are specifically formulated for that. If you're in an older property with lead pipework, look for NSF-certified options: the Waterdrop PT-05B carries NSF certification and explicitly targets lead and fluoride alongside chlorine. The BRITA MAXTRA PRO Pure Performance 12-pack adds PFAS and pesticide reduction, which is useful if your local supply has agricultural runoff. FilterLogic's universal cartridges are compatible with Brita Maxtra+ jugs and cost less per filter, but they don't carry the same third-party certifications — a trade-off worth understanding before you buy.
03Running costs and cartridge lifespan
The upfront jug price is only part of the story. Each BRITA MAXTRA PRO Pure Performance cartridge in the 12-pack works out at roughly £3.33 per month if you replace it every four weeks. The FilterLogic 6-pack at £12.49 brings that down to about £2.08 per cartridge. The Waterdrop PT-05B includes a 90-day filter, so you're replacing it just four times a year — handy if you dislike the admin of monthly swaps. Aqua Optima's Evolve+ cartridges are rated for 30 days each, so the 6-cartridge bundle with jug at £22.00 gives you six months of filtered water included. Always factor in the cost of replacements over 12 months, not just the shelf price of the jug.
04Build quality and ease of use
BPA-free plastic is standard across all the products here, which matters given that UK tap water is already safe — you don't want the filter housing introducing new concerns. The BRITA Marella XL has a flip-lid for one-handed filling and a digital filter-life indicator (LTI), which removes the guesswork of when to replace the cartridge. The Aqua Optima Liscia is dishwasher-safe (excluding the filter itself), which is a genuine convenience for busy households. The Waterdrop Elfin's slim profile and blue-tinted body are designed to look presentable on a fridge shelf rather than hidden away. If you're buying replacement cartridges only, check compatibility carefully: FilterLogic's universal packs fit Brita Maxtra+, PerfectFit, and Maxtra Pro All-in-1 jugs, but not every Brita model.
Our top picks
Best for first-time buyers on a tight budgetAqua Optima Liscia Water Filter Jug
At £11.24 — and with a 90-day low of £9.00 — the Aqua Optima Liscia with three Evolve+ cartridges is the most affordable complete starter kit here. The 2.5L jug is dishwasher-friendly (minus the filter), fits standard UK fridge door shelves, and reduces limescale and chlorine.
Best value bundle for six months of filtered waterAqua Optima Liscia Water Filter Jug
The Aqua Optima Liscia with six Evolve+ cartridges costs £22.00 — currently at its 90-day high, so worth waiting for a dip toward its £15.00 low before buying. Six cartridges cover roughly six months of daily use, making the per-filter cost competitive. The 2.5L fridge-friendly jug and dishwasher-safe design are identical to the three-pack, so you're simply buying peace of mind on replacements.
Best for hard-water areas with lead pipe concernsWaterdrop PT-05B Elfin Water Filter Jug
The Waterdrop PT-05B is NSF certified and explicitly reduces lead, fluoride, and chlorine — a meaningful distinction if you're in an older UK property with original pipework. The included 90-day filter means fewer cartridge changes per year. At £19.99 current price (90-day low: £12.59), it's worth setting a price alert. The slim 2.5L body fits upright in most fridge doors and the BPA-free build is reassuring.
Best large-capacity jug for familiesBRITA Marella XL Water Filter Jug
The BRITA Marella XL holds 3.5L — 40% more than the 2.5L alternatives — and includes a digital filter-life indicator so you never guess when to replace the MAXTRA PRO cartridge. At £18.99 (down from a 90-day high of £23.00), it's good value right now. The flip-lid allows one-handed filling, useful when you're juggling a kettle and a toddler. Confirm your fridge shelf depth before ordering.
Best cartridge upgrade for PFAS and pesticide reductionBRITA MAXTRA PRO Pure Performance Water
The BRITA MAXTRA PRO Pure Performance 12-pack at £39.93 (90-day low: £34.99) works out at under £3.33 per cartridge and adds PFAS and pesticide filtration on top of standard limescale and chlorine reduction. A full year's supply in one order also cuts down on repeat purchases — practical for households that already own a compatible BRITA jug.
Best budget cartridge replacement for Brita jug ownersFilterLogic Universal 6 Pack Filter Cartridges
FilterLogic's 6-pack at £12.49 — its 90-day low — is compatible with Brita Maxtra+, PerfectFit, Maxtra Pro All-in-1, and Marella jugs, as well as Bosch Tassimo machines. At roughly £2.08 per cartridge, it undercuts genuine BRITA replacements significantly. The trade-off is the absence of third-party NSF certification, so if contaminant removal beyond chlorine and limescale is a priority, stick with the branded options.
Frequently asked
How often should I replace my water filter cartridge in the UK?
Most standard cartridges are rated for 30 days or 100–150 litres, whichever comes first. In hard-water areas such as London, the South East, and the Midlands, cartridges can exhaust faster because they work harder on limescale. The BRITA Marella XL's digital indicator removes the guesswork. The Waterdrop PT-05B's 90-day filter is the exception — it's rated for a full three months, so you only replace it four times a year.
Are FilterLogic cartridges as good as genuine BRITA filters?
FilterLogic cartridges are compatible with most BRITA Maxtra+ jugs and cost noticeably less per unit. They reduce chlorine and limescale effectively for most households. However, they do not carry NSF certification or BRITA's own testing for PFAS, pesticides, or lead. If your water supply has specific concerns beyond taste and limescale — particularly relevant in older properties or agricultural areas — the genuine BRITA MAXTRA PRO Pure Performance cartridges offer broader, independently verified filtration.
Will a 2.5L filter jug fit in my fridge door?
Most 2.5L slim-profile jugs, including the Waterdrop PT-05B and Aqua Optima Liscia, are designed to fit upright on a standard UK fridge door shelf. Typical door shelf depths run between 100mm and 130mm. Measure your shelf depth before buying, particularly if you have a compact under-counter fridge. The BRITA Marella XL at 3.5L is wider and taller, so check the product dimensions against your specific fridge model.
Do water filter jugs remove limescale from kettle water?
Yes, filtering your tap water before filling the kettle reduces the mineral content that causes limescale build-up. This is particularly useful in hard-water areas across southern England. The BRITA MAXTRA PRO Limescale Expert cartridges are specifically formulated for appliance protection. Over time, using filtered water can extend the life of your kettle's heating element and reduce the frequency of descaling — a practical saving for households that boil water multiple times a day.
What is the cheapest water filter jug available in the UK?
The Aqua Optima Liscia with three Evolve+ cartridges is currently £11.24, with a 90-day low of £9.00 — making it the most affordable complete jug-and-filter bundle in this guide. It includes three months' worth of cartridges, reduces limescale and chlorine, and is dishwasher-friendly. For cartridge-only purchases, the FilterLogic 6-pack at £12.49 is the lowest-cost replacement option for existing Brita Maxtra+ jug owners.