We analysed the Amazon.co.uk subcategory Filter Cartridges and kept only products with at least 200 reviews and 4.3 stars. Ranked by estimated monthly revenue, the ten below run from £2.50 to £39 per cartridge — and three of them will not go near a jug, because this node also holds tap and under-sink refills.
The revenue leader is not a Brita product: a third-party refill sold for Brita jugs at £2.50 a cartridge, carried by only 265 reviews.
Check the price on AmazonThe revenue leader is not a Brita product: a third-party refill sold for Brita jugs at £2.50 a cartridge, carried by only 265 reviews.
Not a jug refill: the P1000 is the cartridge for BRITA filter taps, which is why one of them costs more than a twelve-pack of jug filters.
Twelve cartridges for £29.99 is £2.50 each, the keenest per-cartridge figure on this page and roughly a year of filtering in one box.
The original-brand twelve-pack at £3.90 a cartridge, about 56% more than the compatible packs above it, and up 13% over the observed period.
The most reviewed listing here by a distance at 94,978 reviews, though that pool covers seven variants — and £15.75 a cartridge is a different running cost entirely.
The highest price on this page at £78, and the only plumbed-in cartridge: it lives under the sink on an InSinkErator hot water tap and is rated at 454 litres.
The same Evolve+ cartridge as rank 3 in a smaller box: £2.92 each instead of £2.50, which is what buying four at a time costs you.
The lowest price on this page at £11.41, but that buys three cartridges — £3.80 each, dearer per unit than either Aqua Optima pack.
£3.17 a cartridge, and the only jug refill here that puts a capacity on the label: up to 250 litres each.
A closed system: these fit Klar jugs and nothing else, the price fell 31% over the observed period, and the title never says how many cartridges are in the pack.
| Product | Score | Stars | Reviews | Feature | Material | Price | Offer |
|---|---|---|---|---|---|---|---|
| 01. BTRSOLUS Brita-Compatible Cartridges, 6-pack Best seller BTRSOLUS · BTRSOLUS |
8.0 | 4.5 ★ | 265 | 6-pack · Brita fit | Activated carbon | £14.99 | Amazon › |
| 02. BRITA P1000 Tap Filter Cartridge, single BRITA · BRITA |
9.0 | 4.7 ★ | 7,551 | single · for taps | Activated carbon | £35.99 | Amazon › |
| 03. Aqua Optima Evolve+ Cartridges, 12-pack Aqua Optima · Aqua Optima |
8.9 | 4.6 ★ | 8,221 | 12-pack · £2.50 each | Activated carbon | £29.99 | Amazon › |
| 04. BRITA MAXTRA PRO Limescale Expert, 12-pack BRITA · BRITA |
8.5 | 4.7 ★ | 930 | 12-pack · original | Activated carbon | £46.80 | Amazon › |
| 05. ZeroWater 5-Stage Replacement Filter, 4-pack Top rated ZeroWater · ZeroWater |
9.1 | 4.4 ★ | 94,978 | 4-pack · 5-stage | Ion-exchange resin | £62.99 | Amazon › |
| 06. InSinkErator F-701R Under-Sink Filter, 2-pack InSinkErator · InSinkErator |
8.6 | 4.7 ★ | 1,057 | 2-pack · under-sink | Carbon block | £78.00 | Amazon › |
| 07. Aqua Optima Evolve+ Cartridges, 4-pack Aqua Optima · Aqua Optima |
8.9 | 4.6 ★ | 8,221 | 4-pack · £2.92 each | Activated carbon | £11.66 | Amazon › |
| 08. Amazon Basics Filter Cartridges, 3-pack Lowest price Amazon Basics · Amazon Basics |
8.9 | 4.5 ★ | 16,236 | 3-pack · Brita fit | Activated carbon | £11.41 | Amazon › |
| 09. Aquaphor Maxfor+ Cartridges, 6-pack AQUAPHOR · Aquaphor |
8.7 | 4.6 ★ | 4,736 | 6-pack · 250 L each | Activated carbon | £18.99 | Amazon › |
| 10. Klar Water Replacement Cartridge, Klar jugs Klar Water · Klar Water |
8.5 | 4.6 ★ | 1,245 | Klar jugs only | Activated carbon | £12.89 | Amazon › |
A cartridge is a consumable, so the only comparable number is the price of one. In this top ten that runs from £2.50 in a twelve-pack to £39 for an under-sink filter sold in twos. Headline prices between £11 and £78 tell you almost nothing until you have divided.
Amazon files three incompatible fittings in this one node. A MAXTRA-shaped jug cartridge, a BRITA P1000 for an on-tap system and an InSinkErator F-701R for a plumbed hot water tap all appear here, and none of them will go in the wrong housing. Check the fitting before the price.
Half of this list is third-party refills sold as fitting Brita jugs — note the asterisks and the wording, because Maxtra and MAXTRA PRO are not the same shape. The original twelve-pack works out at £3.90 a cartridge against £2.50 for the compatibles, which is what the guaranteed fit costs.
Four weeks is a guess about your household; litres is a measurement. Only two listings here state one — 250 litres for the Aquaphor and 454 litres for the under-sink filter. A family that drinks and cooks with filtered water will get through a jug cartridge long before the calendar says so.
Standard carbon refills are sold against limescale and chlorine — taste and kettle scale. The ZeroWater is an ion-exchange filter sold against lead and PFOA/PFOS, the Klar against fluoride. If you are buying for a specific contaminant rather than for taste, that difference is the whole purchase.
A twelve-pack is the cheapest per cartridge but commits you to about a year of one system. Prices here moved between −31% and +13% during the observed period, so a bulk box locks in a price that may or may not look clever in six months.
Usually yes, but check which Brita system you own. Compatible refills from Aqua Optima, Amazon Basics, Aquaphor and BTRSOLUS are all sold as fitting Brita jugs, and several use the asterisk wording that signals they are an alternative rather than a licensed part. Jugs designed for MAXTRA PRO can be fussier than older Maxtra models, and the lid indicator will not reset itself for a third-party filter.
Because they are not the same kind of part. The BRITA P1000 is a single cartridge for an on-tap filter and the InSinkErator F-701R is an under-sink cartridge for a hot water tap, both of which are plumbed-in systems. Jug refills are sold in threes, fours, sixes and twelves, which is where the £2.50 to £3.90 range comes from.
Amazon pools reviews across the variants of a listing. The Aqua Optima twelve-pack and four-pack both show 8,221 reviews for that reason, and the ZeroWater figure of 94,978 covers seven pack sizes. Treat the star rating as a verdict on the product family, not on the specific box you are putting in the basket.
The products are ordered by estimated monthly revenue per ASIN, not by star rating and not by bestseller rank. Only products with at least 200 reviews and an average of 4.3 stars were included. In a consumable category revenue is a good proxy for what people actually keep re-ordering, rather than what they bought once.
The score is not our own hands-on test. It is calculated transparently from public Amazon data: 75% from the average star rating and 25% from the number of reviews, weighted logarithmically. The ranking order itself comes from estimated monthly revenue per ASIN. Prices, ratings and review counts were retrieved from Amazon.co.uk on 22 July 2026 and can change at any time.
Affiliate disclosure: As an Amazon Associate we earn from qualifying purchases — at no extra cost to you. All links are affiliate links. Prices are snapshots taken on 22 July 2026; the current price is shown live on Amazon. Product images and details come from Amazon or the manufacturers.