A bottle-mounted filter that names its medium and quotes a 4000 litre cartridge life, then leaves out the pore size entirely — the figure that would say what that medium is built to hold back.
The bottom line The medium is named and the litres are generous. The pore size — the figure the rest of this shelf leads with — is simply not there.
What this listing puts on record
A KDF-55 filter medium, a cartridge life given as 4000 L in the title, a universal bottle adapter stated to fit almost all common bottle sizes, a BPA-free build, and a description of the whole as light and compact.
Naming a medium is not the same as rating it
KDF-55 is a real answer to a real question. Most listings at this end of the shelf say activated carbon and stop, or say nothing at all. Naming the medium tells you which family of element is in the housing.
But there is no pore size. Nothing states a micron figure, in the title or the bullets. That leaves the listing describing what the element is made of without describing how finely it is built, and those are two separate columns on this hub for a reason.
Weight and flow
Neither is published. Light and compact is a description, not a figure, and it cannot be lined up against the 130 g that a maker in the hydration family manages to print.
How the maker’s claims are written here
The listing puts a 99.99 % figure against bacteria, and names chlorine and heavy metals. Written properly, that reads the maker states 99.99 % of bacteria — the verb stays with the maker. This page says nothing about what the water leaving the filter may be used for; the maker’s instructions and your local authority are where that belongs.
Before ordering
Measure the neck of the bottle you plan to use it on. Almost all common sizes covers a lot of ground, and the only way to know whether it covers yours is to check the thread before the parcel arrives.
Availability
Selling at about 20 € on the German Amazon store when this page was checked.
Catalogued on the French, Italian and Spanish Amazon stores with nobody selling it: the reference is there, the offer is not.
Nothing came back from the American and British Amazon stores, so the buy link there opens a local search instead of a page that is not there.
Every figure in this section is what Keepa returned on the day this page was last updated. Prices and offers change without notice.
Prices quoted in this text were read on 6 September 2026. The live price is at the top of the page.
What it does well, and where it gives way
Strengths
Names the filter medium as KDF-55 instead of calling it a filter, which is more than most of this shelf does
States a 4000 litre cartridge life, at the long end of what this family publishes
Supplies a bottle adapter the maker states fits almost all common bottle sizes, so it is not tied to one vessel
Compromises
No pore size anywhere, so the one figure that describes what the element holds back is absent
No flow rate, and a KDF medium behaves differently from a hollow fibre in that respect
Universal is a word, not a thread size: whether it meets your bottle is still a measurement you take yourself
Specifications
Micron rating
Not published on the listing — the medium is named but never given a pore size
Filter element type
KDF-55 filter medium — stated; the maker describes it as removing heavy metals and chlorine
Stated flow rate
Not published on the listing
Cartridge life
4000 litres — stated in the title
Weight
Not published on the listing — described as light and compact, without a figure
Format
Bottle-mounted filter with an adapter — stated
Bottle thread compatibility
A universal adapter, stated to fit almost all common bottle sizes; no thread size in millimetres is given
Amazon reference
B0H56N6L8R (same reference on 4 Amazon marketplaces)
EAN
8720892948212
What people ask before buying
What is KDF-55?
It is a copper-zinc medium named by the maker in this listing, described here as removing heavy metals and chlorine. Naming it is useful because it says what class of element you are buying. It is not a pore size, and the listing gives none.
Why does a missing micron rating matter?
Because cartridge life and pore size answer different questions. The litres tell you how long the element is stated to last; the microns describe how it is built. A listing with one and not the other is half a specification.
Press filter bottle · 500 ml · 0.2 micron stated · hollow fibre with carbon · 1500 litre cartridge
A 500 ml press bottle that publishes volume, pore size, element type and cartridge life — four of the seven columns this hub compares — and quotes the coarsest micron figure of the six filters here that give one.
Best for: A short walk or a run where one small bottle refilled at the stream is the whole water plan.
Filter and bottle set · 0.1 micron stated · hollow-fibre membrane · 4000 litre cartridge · 0.5 L bottle
A hollow-fibre filter sold with the bottle it screws onto, publishing both a 0.1 micron pore size and a 4000 litre cartridge life — and, because the bottle comes in the box, never needing to say what thread the filter takes.
Best for: A day walk where the water is refilled often and the whole set can live in a hip pocket.
Press bottle · 710 ml · 250 litre replaceable cartridge · no pore size published
A 710 ml press bottle with a replaceable cartridge rated at 250 litres, and the most talkative claim list on this shelf — every one of which is written here as the maker’s claim, because no pore size is published to check any of it against.
Best for: Travel where one bottle is treated at a time and the cartridge is expected to be replaced as a routine cost.
