United States
Press-through bottles with long claim lists and no pore size behind them
The GRAYL entries here are not a matched pair. The bottle reviewed on this site is the GeoPress, at 710 ml. The cartridge listed here is the replacement purifier cartridge for the UltraPress, a different bottle of 16.9 fl oz. Both listings name their housing precisely, which is the one thing a spare part cannot afford to leave vague, so the information is there — it just has to be read rather than assumed.
It publishes its life two ways: 300 press cycles, quoted by the maker as 40 gal./150 L. That double figure lets it be compared with cartridges counted either by volume or by use, which is more than most of that shelf offers. It also states a ten-year shelf life for an unused cartridge, which is the fact that decides whether a spare can sit in a drawer between trips or has to be bought on the way out. The GeoPress bottle, for its part, publishes 710 ml in milliliters and in ounces, states a 250 liter cartridge life, and states that the format needs no pumping, no batteries and no chemicals.
Neither page publishes a micron rating. On listings that make a long series of claims about what the element holds back, the pore size is the specification those claims would be checked against, and it is Not published on the listing in both cases. On this site every such claim is reported as the maker’s own, because there is nothing else to report it as — and no filter here is described as making a water source safe to drink. That is a matter for the maker’s instructions and for local advice.
No flow rate on either page, which on a press bottle is the everyday experience of using it. No weight on either. No thread standard on the cartridge, so it can only be ordered by bottle name. And the cartridge capacities are short: 250 liters for the GeoPress element and the maker’s quoted 150 liters for the UltraPress, on a shelf where other elements are rated far higher. Buy in with the replacement cost counted in from the start.
Press bottle · 710 ml · 250 liter replaceable cartridge · no pore size published
A 710 ml press bottle with a replaceable cartridge rated at 250 liters, 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.
