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Names its pump, and publishes nothing else whatsoever

MSR replacement cartridge for the Guardian pump purifier

Four bullets, one of which names the pump it belongs to and three of which say nothing — five of the six columns here left blank, and the one that is filled is the one that decides.

MSR Guardian replacement cartridge for a pump water purifier

MSR replacement cartridge for the Guardian pump purifier

Four bullets, one of which names the pump it belongs to and three of which say nothing — five of the six columns here left blank, and the one that is filled is the one that decides.

Compatible housings
The maker's own Guardian pump purifier — stated in the title and in the first bullet
Thread standard
Not published on the listing
Stated pore rating
Not published on the listing
Rated capacity
Not published on the listing — no litre figure, no cycle count and no service interval appear
Stated flow rate
Not published on the listing
Backflush method
Not published on the listing
Amazon reference
B0199BGJ8C (same reference on 6 Amazon marketplaces)
EAN
0040818024072
  • Names the pump it belongs to in the title and again in the bullets, which is the one field a spare part cannot leave blank
  • Sold as the maker’s own cartridge for its own purifier, so the fit is the maker’s statement rather than an inference
  • Five of the six columns this hub compares are empty, matched here only by the under-sink cartridge

Best for: Guardian pump owners buying the maker’s own cartridge, with the specification looked up in the manual rather than on the listing.

≈ $180 / £156 / 123 €
Check price on Amazon

Specifications

Compatible housings
The maker's own Guardian pump purifier — stated in the title and in the first bullet
Thread standard
Not published on the listing
Stated pore rating
Not published on the listing
Rated capacity
Not published on the listing — no litre figure, no cycle count and no service interval appear
Stated flow rate
Not published on the listing
Backflush method
Not published on the listing
Amazon reference
B0199BGJ8C (same reference on 6 Amazon marketplaces)
EAN
0040818024072

What this listing puts on record

A replacement cartridge for the maker’s Guardian purifier. Then: Unisex. One Size. Mountaineering and trekking, camping. That is the whole of it.

One field filled, five empty

The housing is named, and nothing else is. No pore rating, no capacity, no flow rate, no thread, no cleaning method — five of the six columns this hub compares stay blank, which only the under-sink cartridge here matches.

There is a case to be made for it, and it is worth making. A spare part that names its housing and claims nothing further has told you the only thing that decides whether it is usable. Four of the seven listings here spend bullets on the bottle rather than the element; this one spends none on anything.

What the missing capacity costs

Cartridge life is how a filter is priced over a season, and this listing gives it in no unit at all. Elsewhere in this hub the published figures run from 150 to 4000 litres, a spread of more than an order of magnitude. Without a number here, the running cost of this cartridge cannot be set against any of them from the listing alone.

Where the specification actually lives

The maker documents the Guardian in its own literature. That is where a pore rating and a service life would be read, and it is also where the maker’s instructions for use sit — which is the document that governs what the purifier is for, on this page as everywhere else on this site.

Before ordering

Confirm that your pump is the Guardian and not another model in the same range, then look the service figures up in the manual before the price. The listing will not supply them.

Availability

Selling between 123 € and 132 € across the German, French, Italian and Spanish Amazon stores when this page was checked.

It also sells on the American and British Amazon stores in the local currency, which the range above does not cover — that range counts euro stores and nothing else.

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.

More water filter cartridges

  • NATURBUMMLER replacement filter element for foldable water filter bottles

    NATURBUMMLER spare element for the 750 ml and 1000 ml filter bottles, 200 litres

    A replacement element sold for two named bottles from the same maker, with a 200 litre rated capacity and nothing published about the membrane behind it.

    Compatible housings
    The maker's own 750 ml and 1000 ml filter bottles — stated as compatible with both
    Thread standard
    Not published on the listing
    Stated pore rating
    Not published on the listing — no micron figure appears in the title or in any of the five bullets
    Rated capacity
    200 litres — stated in the title and repeated in the bullets
    Stated flow rate
    Not published on the listing
    Backflush method
    Not published on the listing — the maker describes changing the element in seconds without tools, which is replacement rather than cleaning
    Amazon reference
    B0C81HV4P1 (same reference on 1 Amazon marketplace)
    EAN
    4262372760067
    • Names the two bottles it belongs to, by capacity, in the first bullet — which is the question a spare element has to answer
    • The 200 litre figure is printed in the title rather than left for the small print
    • No pore rating anywhere, which leaves the column this hub leads with empty

    Best for: Keeping a NATURBUMMLER filter bottle in service without hunting for the model number.

    ≈ 15 €
    Check price on Amazon
  • OUTDOOR-FRIENDS EasyPress replacement filter element for a press-through water bottle

    OUTDOOR-FRIENDS EasyPress replacement element, 0.01 micron stated, 2000 litres

    A spare element publishing the finest pore rating and the second-longest capacity on this shelf, sold by a model number that the listing itself gives twice and differently.

    Compatible housings
    The maker's own EasyPress filter bottle — stated; the listing identifies the element by a model number, and the title and the recorded part number give different ones
    Thread standard
    Not published on the listing
    Stated pore rating
    0.01 micron — stated as 0.01 µm in the title
    Rated capacity
    2000 litres — stated in the title as a filter capacity
    Stated flow rate
    Not published on the listing — the maker describes pressing as needing no great force, which is not a figure
    Backflush method
    Not published on the listing
    Amazon reference
    B0D9R1B2FK (same reference on 4 Amazon marketplaces)
    EAN
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    • Publishes a pore rating and a capacity together in the title, which two of the seven cartridges here manage
    • 0.01 micron is the finest figure published on this shelf, and 2000 litres is second only to the 4000 litre element in this hub
    • The bullets describe the bottle — magnetic lid, grip band, handle — rather than the element being sold

    Best for: Replacing the element in an EasyPress bottle, once the model number on your own filter has been read off it.

    ≈ 24 €
    Check price on Amazon
  • BACHGOLD replacement filter element for a squeeze outdoor water filter

    BACHGOLD two-stage replacement element for the maker's Squeeze filter, 0.2 micron stated

    A two-stage element for the maker's Squeeze filter — and a different housing from the Selfpress bottle reviewed on this site, which is exactly the distinction this hub exists to keep.

    Compatible housings
    The maker's own Squeeze outdoor water filter — stated as the original replacement element for it, developed for an exact fit
    Thread standard
    Not published on the listing
    Stated pore rating
    0.2 micron on the hollow-fibre stage — stated as a 0.2 micron hollow-fibre membrane
    Rated capacity
    Not published on the listing — no litre figure and no service interval appear anywhere
    Stated flow rate
    Not published on the listing — the maker describes manual squeeze operation without quantifying it
    Backflush method
    Not published on the listing — the maker advises pre-filtering heavily sedimented water instead
    Amazon reference
    B0FL8YCP6Z (same reference on 6 Amazon marketplaces)
    EAN
    7649988624858
    • Names both stages rather than calling the element a filter — an electro-adsorptive nanofibre layer and a hollow-fibre membrane, in that order
    • Publishes a pore rating flat at 0.2 micron, with no hedge in front of the number
    • No rated capacity at all, which is the figure that turns a cartridge price into a cost per litre

    Best for: Owners of the maker's Squeeze filter who want the original element rather than a look-alike.

    ≈ $15 / £17 / 20 €
    Check price on Amazon

Others worth keeping in the pack

  • PAIDASHU black elastic travel clothesline with coloured pegs and steel hooks

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    A short elastic line with two steel hooks and the largest bundle of fittings on this shelf — and a listing that calls it a pegless line in one breath and counts twelve pegs in the next.

    Length
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    Cord construction
    A stretchable black cord carrying positioning beads that slide smoothly along it from left to right — stated; no twist, braid or double line is described
    End fittings
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    Tensioner type
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    Stated weight
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    Packed size
    Not published on the listing
    Pegs supplied
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    Amazon reference
    B0BJPNTXFJ (same reference on 5 Amazon marketplaces)
    EAN
    0768479528059
    • Two stainless steel hooks, so the line goes up without a knot
    • Twenty-five fittings supplied between the pegs and the clips, the largest bundle on this shelf
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    Best for: A tent porch or a hotel bathroom, where a short elastic run and a bag of clips do the job.

    ≈ £7 / 9 €
    Check price on Amazon
  • Coil of Rayen grey nylon washing line

    Rayen nylon washing line, 20 metres, non-slip coating

    A twenty metre length of coated nylon rope sold for the house and the garden — the longest line here by a wide margin, and the only one supplied with nothing at all on the ends.

    Length
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    Cord construction
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    End fittings
    Not published on the listing — nothing is described at either end of the rope
    Tensioner type
    Not published on the listing
    Stated weight
    Not published on the listing
    Packed size
    Not published on the listing — no bag, reel or coil size is described
    Pegs supplied
    Not published on the listing — no pegs, clips or beads are mentioned anywhere on the listing
    Amazon reference
    B07Q1GSFYV (same reference on 6 Amazon marketplaces)
    EAN
    8412955003388
    • The longest line on this shelf at 20 m, which is five times the next longest run
    • A non-slip coating is named, which is at least a claim about the surface rather than about the material alone
    • Nothing at either end, so every pitch begins with two knots

    Best for: A long run between two fixed points, by someone who is happy to tie knots and carry pegs.

    ≈ £6 / 6 €
    Check price on Amazon
  • Sea to Summit black double clothesline with rubber beads in its nylon bag

    Sea to Summit double line with rubber beads, 3.5 m, 25 g

    A double line whose rubber beads trap fabric between two parallel cords, and the lighter of the two lines here that publish a weight, at a stated 25 g.

    Length
    3.5 m — stated in the title and repeated in the bullets, where the maker also gives it as 11 feet
    Cord construction
    Two parallel cords with rubber beads that hold garments in place without pegs — stated, and described in the title as a reflective double line with beads
    End fittings
    Not published on the listing — nothing is described at either end of the line
    Tensioner type
    Not published on the listing
    Stated weight
    25 g — stated in the title
    Packed size
    Not published on the listing — the maker states it packs into a small nylon bag and gives no dimension for it
    Pegs supplied
    None, and none needed — stated in the title and in the first bullet, where the beads and the two cords are given as what does the holding
    Amazon reference
    B000T28X4E (same reference on 6 Amazon marketplaces)
    EAN
    9327868008698
    • The lighter of the two lines here that publish a weight, at a stated 25 g
    • A genuine pegless construction — two cords and beads — rather than a coating claim
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    ≈ $13 / £14 / 13 €
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