Test: We tested the technology in the filter bottle, which also cleans the water from the lake – Technologies – Science and technology

The Lifesaver bottle uses its own technology for efficient water filtration. It cleans rainwater, water from streams and lakes so that it has no odor, flavor and is free of viruses, bacteria and microorganisms.


LifeSaver Liberty filter bottle.

We tested a non-traditional water filter bottle, which, according to the British manufacturer LifeSaver, can catch almost all bacteria, viruses and microorganisms. The Liberty bottle is quite large and takes up a lot of space in the backpack. Due to the fact that it contains a massive filter, only 400 milliliters of water can fit in it at a time. It does not matter whether you take water from a stream, spring or pond into a bottle. According to the manufacturer, the filter should be 99.99 percent effective in removing bacteria, viruses and microorganisms.

Robust design, but handling the bottle requires a habit

In addition to the bottle itself, the package also includes a package for accessories – a carbon disc and a pump hose with a float. Liberty can be used in two ways. Either pour water into it or pump it into the container through a connected hose. Subsequently, with the help of the piston on the underside and after releasing the safety at the neck of the bottle, you can filter the water into the second container, or drink directly from the bottle. The hose, through which it is also possible to “refuel” the water in the bottle, has a very comfortable length of 1.5 meters. According to the manufacturer, it is possible to filter about 1.2 liters of water in one minute. In our experience, it’s about half a liter in 30 seconds. However, it depends on the pumping speed.

Using a piston, water is forced through the filter. Photo: tš

LifeSaver, Liberty, filter bottle Using a piston, water is forced through the filter.

However, before the first use, it is necessary to place a carbon disk (for 500 liters of water) in the upper part of the bottle and clean the filter cartridge. The carbon disk was very difficult to replace for the first time, as the neck of the bottle was very tight. It was necessary to exert excessive force to unscrew the upper part where the disk is placed. We poured water into the container, waited 5 minutes and then pushed through the filter. After this operation, the filter was ready for full use.

One filter is enough for 2000 liters of water

We have not yet pumped the entire volume of water for which it is intended, ie 2000 liters, through the filter, but the manufacturer claims that once the filter reaches its limit, it will “get stuck” and it will not be possible to push more water through the cesium. In this case, all that remains is to replace the filter cartridge. The disadvantage is that you will not find out how much filtering you have behind and in front of you during use. So you only have to follow your own estimate, or have a spare filter with you after more intensive use. Containers can also be screwed to Liberty, but only wide-necked containers fit. However, it is possible to do without problems without it.

The replaceable filter is massive and takes up ... Photo: tš

LifeSaver, Liberty, filter bottle The replaceable filter is massive and takes up a lot of space in the bottle. This is also the reason why the bottle has a volume of only 400 milliliters.

The taste of the purified water was completely neutral, free of minerals and other soluble substances that could affect it. It resembled water filtered through carbon cartridges in filter kettles. Through Liberty, we cleaned water from a natural stream in the Slovak Paradise, as well as from a small lake. In both cases, the taste was the same and there were no stomach problems. The water was completely clear, there was no sand, fine gravel or other impurities in it.

The filter has a very fine membrane at the other end. Photo: tš

LifeSaver, Liberty, filter bottle The filter has a very fine membrane at the other end.

High price of spare parts

LifeSaver Libery will be appreciated by people on multi-day hiking, or on more demanding ascents in the mountains, provided that they want to save a few kilograms of water transferred in a backpack. However, the filter bottle is relatively expensive (139 euros) and from time to time it is necessary to replace the carbon filters (every 500 liters) for 21 euros for 3 pieces and the filter cartridge for 55 euros for one piece. The bottle is very robust, durable, but also heavier. Initial manipulation may seem complicated, but it’s just a matter of habit and routine.

LifeSaver Liberty – price: 139 eur

Rating: 8.5 / 10


  • Very efficient filtration of polluted water
  • Filtering speed
  • Filter capacity
  • Accessories


  • High price
  • Expensive replacement filters
  • Missing filter status indication

Source: Pravda.sk – Veda a technika by vat.pravda.sk.

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