A dishwasher-safe water filter jug saves you scrubbing limescale from the lid every week, and in hard-water areas across the South East and Midlands that matters more than most manufacturers admit. Jugs in this guide start at £16.99, with replacement cartridges from £12.49 for a six-pack, so the running costs are just as important as the upfront price.
What to look for
01Dishwasher compatibility: which parts actually go in
Not every component of a filter jug is dishwasher-safe, even when the brand markets it that way. Typically, the outer jug body and lid can go on the top rack at 40°C or below, but the filter cartridge itself must never enter a dishwasher. Heat and detergent destroy the ion-exchange resin and activated carbon inside, rendering it useless. Before you buy, check the manufacturer's instructions for each individual part. BRITA's Marella range, for instance, specifies that the jug body and lid are top-rack safe, while the MAXTRA PRO cartridge is removed first. The Waterdrop PT-05B Elfin is a compact 2.5L option worth checking on this point too. If you run a dishwasher at 60°C or higher for hygiene cycles, always remove the jug before that programme runs.
02Capacity and fridge fit for UK kitchens
Most UK fridge doors have a shelf around 100–120mm deep, which rules out wide-bodied jugs. The BRITA Marella XL holds 3.5L total (roughly 2.0L filtered at any one time) and is designed with a slim profile to sit upright in a standard fridge door shelf. The smaller BRITA Marella manages 2.4L total. If you have a compact under-counter fridge, common in UK flats and studio apartments, the Waterdrop Elfin at 2.5L is worth considering for its narrower footprint. As a rule, measure your fridge shelf depth before ordering: a jug that won't fit upright is useless, regardless of filter quality.
03Filter cartridge cost and replacement frequency
The upfront jug price is rarely the biggest expense. BRITA MAXTRA PRO Pure Performance cartridges need replacing roughly every four weeks or 150L, so a household of two to three people will get through around 12 cartridges a year. At £39.93 for a 12-pack, that works out to about £3.33 per cartridge. The FilterLogic FL402H, compatible with BRITA MAXTRA+ Plus jugs, costs £12.49 for six, or roughly £2.08 each, and has sat at that price for the full 90-day tracking window. For hard-water areas, the BRITA MAXTRA PRO Limescale Expert six-pack at £23.40 (90-day low: £18.00) is formulated to reduce limescale more aggressively, which matters if you live in London, Kent, or the Thames Valley.
04Filtration standards: what NSF certification means
NSF International certification is a meaningful benchmark. It means an independent laboratory has verified that the filter reduces specific contaminants by a stated percentage under controlled conditions. The Waterdrop PT-05B Elfin carries NSF certification, which is worth noting at its price point of £16.99. BRITA's MAXTRA PRO Pure Performance cartridges are tested to reduce chlorine, PFAS, pesticides, and limescale, though BRITA uses its own internal testing protocols alongside third-party verification. If you are on mains tap water in England or Wales, the water is already safe to drink by law, so filtration is primarily about taste, limescale reduction, and peace of mind rather than safety.
Our top picks
Best for families wanting a large, fridge-friendly jugBRITA Water Filter Jug MAXTRA Marella
Currently £19.99 (90-day low: £13.00), the BRITA Marella XL in blue holds 3.5L and ships with one MAXTRA PRO Pure Performance cartridge. Its slim profile fits standard UK fridge door shelves, and the jug body and lid are top-rack dishwasher-safe once you remove the cartridge. For a household of three or four, the larger reservoir means fewer refills per day.
Best starter bundle with cartridges includedBRITA Water Filter Jug MAXTRA Marella
At £19.99, the BRITA Marella 2.4L white jug comes with three Pure Performance cartridges, giving you roughly three months of filtered water before you need to reorder. That is strong value compared to buying jug and filters separately. The 2.4L size suits a couple or small family, and the body is top-rack dishwasher-safe with the cartridge removed.
Best compact option for small flats or solo useWaterdrop PT-05B Elfin Water Filter Jug
The Waterdrop PT-05B Elfin costs £16.99 (90-day low: £12.59, a drop of £4.40) and holds 2.5L, making it one of the more affordable NSF-certified jugs available in the UK. Its narrower footprint suits under-counter fridges common in studio flats. The 3-month filter life reduces how often you handle cartridges, which is a practical advantage in a small kitchen.
Best value replacement cartridges for BRITA jug ownersFilterLogic FL402H | 6X Filter Cartridge
FilterLogic FL402H cartridges are compatible with BRITA MAXTRA+ Plus jugs and cost £12.49 for six, a price that has held steady across the full 90-day tracking window. At roughly £2.08 per cartridge versus £3.33 for official BRITA 12-packs, the saving is meaningful over a year. A practical choice if you already own a compatible BRITA jug and want to reduce running costs.
Best cartridges for hard-water areas like London and the South EastBRITA Water Filter Cartridge MAXTRA PRO
The BRITA MAXTRA PRO Limescale Expert six-pack is £23.40 now, down from a 90-day high of £25.99, with a 90-day low of £18.00. The Limescale Expert formulation is specifically designed to tackle the high calcium carbonate levels found in London, Kent, and Thames Valley tap water. If your kettle furs up within weeks of descaling, this cartridge variant is worth the small premium over standard MAXTRA PRO.
Frequently asked
Can you put a BRITA water filter jug in the dishwasher?
The jug body and lid of most BRITA Marella models are top-rack dishwasher-safe, but the filter cartridge must always be removed first. Heat and detergent will destroy the activated carbon and ion-exchange resin inside the cartridge, making it ineffective. Place only the plastic components on the top rack, use a cool or eco programme where possible, and refit a fresh or rinsed cartridge once everything has dried.
How often should I replace my water filter cartridge in the UK?
BRITA MAXTRA PRO cartridges are rated for approximately four weeks or 150 litres, whichever comes first. For a UK household of two adults, that typically means one cartridge per month, or 12 per year. In hard-water areas such as London or the South East, you may find cartridges exhaust faster because they are working harder to reduce limescale. BRITA's MEMO function or app reminder helps you track replacement dates.
Are third-party filter cartridges as good as BRITA originals?
Compatible cartridges such as FilterLogic FL402H are designed to fit BRITA MAXTRA+ Plus jugs and reduce chlorine and limescale, but independent filtration testing data is less comprehensive than BRITA's published figures. For most UK households drinking already-safe mains water, the taste and limescale reduction from a quality compatible cartridge is adequate. If you have specific concerns about PFAS or pesticides, BRITA's own MAXTRA PRO Pure Performance cartridges publish more detailed contaminant-reduction data.
What size water filter jug fits in a standard UK fridge door?
Most UK fridge door shelves are 100–120mm deep. The BRITA Marella XL (3.5L) and standard Marella (2.4L) are both designed with a slim profile to fit upright in a fridge door. Measure your shelf depth before ordering. If you have a compact under-counter fridge, a smaller jug such as the Waterdrop Elfin at 2.5L is a safer choice. A jug that cannot stand upright in the fridge is impractical for daily use.
Is filtered water worth it if UK tap water is already safe?
Tap water in England and Wales meets strict legal safety standards, so filtration is not a health necessity for most people. The main practical benefits in the UK are improved taste by reducing chlorine, and reduced limescale in hard-water areas, which also extends the life of your kettle. Running costs for a BRITA-compatible setup are roughly £25–£40 per year in cartridges, which many households find worthwhile for better-tasting tea and coffee.