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A liquid filtration method and device, for example a drinking straw with a mouthpiece, and a bundle of hollow fibres. The open ends of the fibres are embedded in a base and provided in a compartment between the base and a liquid outlet. Water or other liquid flows into the inner volume of the hollow

A liquid filtration method and device, for example a drinking straw with a mouthpiece, and a bundle of hollow fibres. The open ends of the fibres are embedded in a base and provided in a compartment between the base and a liquid outlet. Water or other liquid flows into the inner volume of the hollow fibres and from there through their filtering membrane walls and into the compartment before the liquid flows out through the liquid outlet, for example the mouthpiece.

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1. A method for filtering liquid, the method comprises providing a filtration device with a liquid inlet and a liquid outlet and a conduit sealingly connected to the liquid outlet for transport of liquid to the liquid outlet; the conduit containing a bundle of hollow fibres; wherein a support member

1. A method for filtering liquid, the method comprises providing a filtration device with a liquid inlet and a liquid outlet and a conduit sealingly connected to the liquid outlet for transport of liquid to the liquid outlet; the conduit containing a bundle of hollow fibres; wherein a support member is sealingly connected to the conduit, thereby defining a compartment between the support member and the liquid outlet; wherein each hollow fibre has a microporous membrane surrounding an inner chamber for filtering microparticles from the liquid when the liquid flows through the membranes; each of the fibres either having one open end supported in the support member and one closed end in a strand extending away from the support member, or each of the fibres having both ends supported in the support member and having a looped part extending away from the support member; wherein the device contains only a single bundle of hollow fibres; the method comprising providing a flow of the liquid through the liquid inlet and through the open ends of the fibres into the inner chambers of the fibres, from the inner chambers through the membranes into the compartment and from the compartment out of the conduit through the liquid outlet, wherein the closed ends or the looped parts extend from the support member into the compartment towards the liquid outlet, wherein the method comprises orienting the filtration device with the liquid inlet downwards, providing the liquid outlet with a mouthpiece and providing a suction force at the mouthpiece with a mouth of a drinker for sucking liquid through the filtration device, and orienting the filtration device with the mouthpiece upwards and the support member downwards relatively to the mouthpiece such that the fibres extend upwards from the support member, wherein the liquid is water and the microparticles comprise microbes said process reduces air trapping in the filtration device and increases membrane water flow. 2. The method according to claim 1, wherein the method comprises pressing liquid by a mouth-blowing action back into the filtration device for backflushing the hollow fibres. 3. A method for filtering liquid and addition of nutrients, the method comprises providing a filtration device with a liquid inlet and a liquid outlet and a conduit sealingly connected to the liquid outlet for transport of liquid to the liquid outlet; the conduit containing a bundle of hollow fibres; wherein a support member is sealingly connected to the conduit, thereby defining a compartment between the support member and the liquid outlet; wherein each hollow fibre has a microporous membrane surrounding an inner chamber for filtering microparticles from the liquid when the liquid flows through the membranes; each of the fibres either having one open end supported in the support member and one closed end in a strand extending away from the support member, or each of the fibres having both ends supported in the support member and having a looped part extending away from the support member; wherein the device contains only a single bundle of hollow fibres; the method comprising providing a flow of the liquid through the liquid inlet and through the open ends of the fibres into the inner chambers of the fibres, from the inner chambers through the membranes into the compartment and from the compartment out of the conduit through the liquid outlet, wherein the closed ends or the looped parts extend from the support member into the compartment towards the liquid outlet, wherein the liquid is water and the microparticles comprise microbes, wherein a nutritional source is provided within the compartment, wherein the method comprises identifying potential users of a number of filtration devices, dividing the potential users into different groups with different group-specific group-characteristics, selecting different compositions of nutritional trace elements in dependence of the group-characteristics, and providing for a plurality of groups different group-specific types of filtration devices with slowly dissolvable nutrition sources containing different, group-specific nutritional compositions. 4. The method according to claim 3, wherein at least some of the groups only contain one group member, and the method comprises providing a personalized filtration device with an individualized nutrition source. 5. A liquid filtration device, wherein the device comprises a liquid inlet and a liquid outlet and a conduit sealingly connected to the liquid outlet for transport of liquid to the liquid outlet; the conduit containing only a single bundle of hollow fibres; wherein a support member is sealingly connected to the conduit, thereby defining a compartment between the support member and the liquid outlet; wherein each hollow fibre has a microporous membrane surrounding an inner chamber for filtering microparticles from the liquid when the liquid flows from the inner chamber through the membranes; the fibres having both ends supported in the support member and having a looped part extending away from the support member, said device being capable of reducing air trapping in the filtration device in operation; the liquid filtration device having a mouthpiece at the liquid outlet, the mouthpiece being shaped for positioning in the mouth of a drinker of the liquid, wherein the looped parts extend from the support member into the compartment towards the mouthpiece, wherein the liquid inlet is provided with a number of pre-filters on the upstream side of the support member, which is opposite to the downstream side and from which the fibres extend into the compartment, wherein the pre-filter is a mesh or a textile filter or a combination thereof, wherein the device is a drinking straw configured for transport of water through the device by an inside-out flow by suction force at the mouthpiece with a mouth of a drinker. 6. The filtration device according to claim 5, wherein the device only has fibres with hydrophilic membranes. 7. A liquid filtration device, wherein the device comprises a liquid inlet and a liquid outlet and a conduit sealingly connected to the liquid outlet for transport of liquid to the liquid outlet; the conduit containing only a single bundle of hollow fibres; wherein a support member is sealingly connected to the conduit, thereby defining a compartment between the support member and the liquid outlet; wherein each hollow fibre has a microporous membrane surrounding an inner chamber for filtering microparticles from the liquid when the liquid flows from the inner chamber through the membranes; the fibres either having one open end supported in the support member and one closed end in a strand extending away from the support member, or the fibres having both ends supported in the support member and having a looped part extending away from the support member; the liquid filtration device having a mouthpiece at the liquid outlet, the mouthpiece being shaped for positioning in the mouth of a drinker of the liquid, wherein the closed ends or the looped parts extend from the support member into the compartment towards the mouthpiece, wherein the liquid inlet is provided with a number of pre-filters on the upstream side of the support member, which is opposite to the downstream side and from which the fibres extend into the compartment, wherein the pre-filter is a mesh or a textile or a combination thereof, wherein the device only has fibres with hydrophilic membranes, wherein the compartment is provided with a biostatic for preventing proliferation of microbes, including bacteria and virus, in the compartment, and wherein the device is a drinking straw configured for transport of water through the device by an inside-out flow by suction force at the mouthpiece with a mouth of a drinker and to reduce air trapping in the filtration device increasing membrane water flow. 8. A liquid filtration device, wherein the device comprises a liquid inlet and a liquid outlet and a conduit sealingly connected to the liquid outlet for transport of liquid to the liquid outlet; the conduit containing only a single bundle of hollow fibres; wherein a support member is sealingly connected to the conduit, thereby defining a compartment between the support member and the liquid outlet; wherein each hollow fibre has a microporous membrane surrounding an inner chamber for filtering microparticles from the liquid when the liquid flows from the inner chamber through the membranes; the fibres either having one open end supported in the support member and one closed end in a strand extending away from the support member, or the fibres having both ends supported in the support member and having a looped part extending away from the support member; the liquid filtration device having a mouthpiece at the liquid outlet, the mouthpiece being shaped for positioning in the mouth of a drinker of the liquid, wherein the closed ends or the looped parts extend from the support member into the compartment towards the mouthpiece, wherein the liquid inlet is provided with a number of pre-filters on the upstream side of the support member, which is opposite to the downstream side and from which the fibres extend into the compartment, wherein the pre-filter is a mesh or a textile or a combination thereof, wherein the compartment is provided with a biocide for killing or deactivating microbes, including bacteria and virus, in the compartment, and wherein the device is a drinking straw configured for transport of water through the device by an inside-out flow by suction force at the mouthpiece with a mouth of a drinker and to reduce air trapping in the filtration device increasing membrane water flow. 9. A liquid filtration device, wherein the device comprises a liquid inlet and a liquid outlet and a conduit sealingly connected to the liquid outlet for transport of liquid to the liquid outlet; the conduit containing only a single bundle of hollow fibres; wherein a support member is sealingly connected to the conduit, thereby defining a compartment between the support member and the liquid outlet; wherein each hollow fibre has a microporous membrane surrounding an inner chamber for filtering microparticles from the liquid when the liquid flows through the membranes; the fibres either having one open end supported in the support member and one closed end in a strand extending away from the support member, or the fibres having both ends supported in the support member and having a looped part extending away from the support member; the liquid filtration device having a mouthpiece at the liquid outlet, the mouthpiece being shaped for positioning in the mouth of a drinker of the liquid, wherein the closed ends or the looped parts extend from the support member into the compartment towards the mouthpiece, wherein the liquid inlet is provided with a number of pre-filters on the upstream side of the support member, which is opposite to the downstream side and from which the fibres extend into the compartment, wherein the device only has fibres with hydrophilic membranes, wherein the filtration device also comprises a nutrition source for human beings.