Filters are the most popular method of ensuring water collected in the outdoors is completely safe to drink, and there are a lot of choices from pump filters to gravity filters from respected brands such as MSR and Katadyn, as well as newer brands such as HydroBlu. The lightest option could be chemical treatment though, for example Micropur tablets weigh virtually nothing, the only compromise compared with a filter is they don't remove particulate matter, but if you expect clear water sources such as running rivers then they could be the best option.

  • Katadyn Micropur Forte MF Water Treatment Tablets - 50 Tablets
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    Katadyn

    Micropur Forte MF Water Treatment Tablets - 50 Tablets

    Weighs
    2g
    Weighs:
    2g

    Katadyn's Micropur Forte water treatment tablets are a handy and easy method of treating water when you're in the middle of no where. These tablets deal with Bacteria, Viruses and Giardia. Coupled with a filter you'll have a formiddable water treatin…

    £18.49
    RRP: £18.49
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  • Katadyn Micropur Forte MF Water Treatment Tablets - 100 Tablets
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    Katadyn

    Micropur Forte MF Water Treatment Tablets - 100 Tablets

    Weighs
    2g
    Weighs:
    2g

    Katadyn's Micropur Forte water treatment tablets are a handy and easy method of treating water when you're in the middle of no where. These tablets deal with Bacteria, Viruses and Giardia. Coupled with a filter you'll have a formiddable water treatin…

    £24.99
    RRP: £24.99
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  • Life Systems Chlorine Dioxide Tablets Life Systems Chlorine Dioxide Tablets
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    Lifesystems

    Chlorine Dioxide Tablets

    Weighs
    10g
    Weighs:
    10g

    An effective way to treat water, which kills most viruses and bacteria including Giardia and Cryptosporidium. Whether on the trail or traveling abroad, it’s always advisable to have some of these on you. Chlorine Dioxide Tablets have the additi…

    £10.99
    RRP: £10.99
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  • Life Systems Chlorine Tablets Life Systems Chlorine Tablets
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    Lifesystems

    Chlorine Tablets

    Weighs
    10g
    Weighs:
    10g

    An effective way to treat water, which kills most viruses and bacteria. Whether on the trail or traveling abroad, its always advisable to have some of these on you. LifeSystems says:  Chlorine is a widely used water disinfectant which kills most…

    £5.99
    RRP: £5.99
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  • Currently out of stock
    LifeStraw Carbon Filter Replacement - 2 Pack

    LifeStraw

    Carbon Filter Replacement - 2 Pack

    Weighs
    10g
    Weighs:
    10g

    Replacement carbon water filter for use with the LifeStraw Go and  LifeStraw Steel. Lifestraw says Protects against chlorine, organic chemical matter, and sand, dirt, cloudiness for improved taste. Compatible with all LifeStraw Go Water Bottles,…

    £10.99
    RRP: £10.99
  • Pure Clear Active Filter Water Cartridge Pure Clear Active Filter Water Cartridge
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    Pure Clear

    Active Filter Water Cartridge

    Weighs
    11g
    Weighs:
    11g

    Replacement filter cartage for use with the Pure Clear Active Water Filter Bottle. Pure Clear says:  Most filters that we see in today's market are Ultrafiltration (UF) filters combined with a carbon block. If you are looking for a filter to...

    £14.99
    RRP: £14.99
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  • Pure Clear Life Filter Water Cartridge Pure Clear Life Filter Water Cartridge
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    Pure Clear

    Life Filter Water Cartridge

    Weighs
    13g
    Weighs:
    13g

     Replacement filter cartage for use with the Pure Clear Life Filter Personal Survival Straw Pure Clear says:  Most filters that we see in today's market are Ultrafiltration (UF) filters combined with a carbon block. If you are looking for a…

    £14.99
    RRP: £14.99
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  • Pure Clear Collapsible Squeeze Cartridge Pure Clear Collapsible Squeeze Cartridge
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    Pure Clear

    Collapsible Squeeze Cartridge

    Weighs
    15g
    Weighs:
    15g

    Replacement filter cartage for use with the Pure Clear Collapsible Squeeze Water Filter Bottle Pure Clear says:  Most filters that we see in todays market are Ultrafiltration (UF) filters combined with a carbon block. If you are looking for a.…

    £14.99
    RRP: £14.99
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  • HydroBlu Sidekick 3-Stage Straw Water Filter HydroBlu Sidekick 3-Stage Straw Water Filter
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    HydroBlu

    Sidekick 3-Stage Straw Water Filter

    Weighs
    16g
    Weighs:
    16g

    This lightweight, compact and practical water filter delivers 3 stage filtration for safe drinking. The straw design is easy to pack and use no matter where you are headed.  HydroBlu says Whether you are hiking, camping, backpacking, or just ne…

    £29.99
    RRP: £29.99
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  • Currently out of stock
    Platypus Gravityworks Carbon Element

    Platypus

    Gravityworks Carbon Element

    Weighs
    28g
    Weighs:
    28g

    Gravityworks Carbon Element helps remove flavors and odors from water. Platypus says Maximize your taste-free water experience with the GravityWorks Carbon Element. It easily splices in after the GravityWorks hollow fiber microfilter, helping to rem…

    £16.99
    RRP: £16.99
  • MSR Trailshot Microfilter Replacement Cartridge
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    MSR

    Trailshot Microfilter Replacement Cartridge

    Weighs
    28g
    Weighs:
    28g (set)

    A handy replacement part for the Trailshot filter, if you ever manage to wear yours out. MSR says: Refreshes the flow rates of your Trailshot Microfilter. This kit contains a replacement filter cartridge for the TrailShot filter, as well as the small…

    £39.99
    RRP: £41.99 | Save: £2.00
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  • MSR Guardian Pump Annual Maintenance Kit
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    MSR

    Guardian Pump Annual Maintenance Kit

    Weighs
    30g
    Weighs:
    30g

    A complete kit for periodic maintenance of your HyperFlow Microfilter pump. MSR says All the necessary components and instructions required to maintain your Guardian purifier’s performance and reliability, packed in a small, convenient carry c…

    £34.99
    RRP: £34.99
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  • Currently out of stock
    Pure Clear 42mm Conversion Cap/Filter Pure Clear 42mm Conversion Cap/Filter

    Pure Clear

    42mm Conversion Cap/Filter

    Weighs
    32g
    Weighs:
    32g

    The Pure Clear 42mm Conversion Cap/Filter is a water filter that can be used as a replacement cap for the Collapsible Squeeze Water Filter Bottle, or it can transform any 42mm mouthed bottle into a water filter. Pure Clear says:  The Pure Clear…

    £24.99
    RRP: £24.99
  • HydroBlu Clear Flow Filter Replacement HydroBlu Clear Flow Filter Replacement
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    HydroBlu

    Clear Flow Filter Replacement

    Weighs
    32g
    Weighs:
    32g

    The Clear Flow Filter Replacement is a combined hollow fibre and activated carbon water filter. Once your Clear Flow has reached the 1500L limit you need to replace it. HydroBlu says The Clear Flow Filter Replacement has been rigorously tested and..…

    £19.99
    RRP: £19.99
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  • Katadyn BeFree Replacement Filter Cartridge Katadyn BeFree Replacement Filter Cartridge
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    Katadyn

    BeFree Replacement Filter Cartridge

    Weighs
    32g
    Weighs:
    32g

    A handy replacement filter for the Katadyn BeFree Water Filtration System, if you ever manage to wear yours out. Katadyn says EZ-Clean Membrane™ Replacement Filter Cartridge for Katadyn BeFree Water Filtration System 0.6L.Our VerdictKatadyn's BeFree…

    £41.99
    RRP: £41.99
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  • MSR Miniworks/Waterworks EX Maintenance Kit
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    MSR

    Miniworks/Waterworks EX Maintenance Kit

    Weighs
    34g
    Weighs:
    34g

    Easy to use maintenance kit for the MSR Miniworks and Waterworks microfilters. MSR says A complete maintenance kit for both MiniWorks and WaterWorks microfilters. Our VerdictComprehensive kit along with other spares. - Reviewed by Ultralight Outdoor…

    £22.99
    RRP: £25.99 | Save: £3.00
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  • HydroBlu Activated Carbon Filter for Versa Flow HydroBlu Activated Carbon Filter for Versa Flow
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    HydroBlu

    Activated Carbon Filter for Versa Flow

    Weighs
    36g
    Weighs:
    36g

    The Versa Flow is a highly effective, versatile and lightweight filter so the ability to add further protection to it in the form of this Activated Carbon Filter is a great option. It works as an add onto your current Versa Flow or as a replacement..…

    £13.99
    RRP: £13.99
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  • LifeStraw GO 2 Stage Replacement Filter GO 2 Stage Replacement Filter
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    LifeStraw

    GO 2 Stage Replacement Filter

    Weighs
    45g
    Weighs:
    45g

    Replacement water filter Compatible with all LifeStraw Go 2-Stage Water Bottles and LifeStraw Universal. Lifestraw says Protects against bacteria, parasites, microplastics, chlorine, organic chemical matter, dirt, sand, and cloudiness; improves taste…

    £23.99
    RRP: £23.99
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  • MSR Hyperflow MicroFilter Maintenance Kit
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    MSR

    Hyperflow MicroFilter Maintenance Kit

    Weighs
    45g
    Weighs:
    45g

    Hyperflow MicroFilter Maintenance Kit, manual included. MSR says A complete kit for periodic maintenance of your HyperFlow Microfilter pump. Our VerdictKit also includes a maintenance manual for the Hyperflow Microfilter. - Reviewed by Ultralight...

    £24.99
    RRP: £25.99 | Save: £1.00
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  • Peak Series SOLO Water Filter Peak Series SOLO Water Filter
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    LifeStraw

    Peak Series SOLO Water Filter

    Weighs
    48g
    Weighs:
    48g

    We're working out what we think - we'll add our view here!  LifeStraw says:  LifeStraw Peak Series Solo Water Filter is an ultra-lightweight (only 1.7oz), compact (just 5.1”), portable water filtration device that removes bacteria,...

    £31.99
    RRP: £31.99
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  • Platypus Gravityworks Replacement Filter Cartridge
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    Platypus

    Gravityworks Replacement Filter Cartridge

    Weighs
    50g
    Weighs:
    50g

    Replacement filter cartridge filters to 0.2 micron. Meets EPA Guide Standard for removal of bacteria and protozoa. Platypus says This replacement filter for the GravityWorks water filter system is effective down to .2 microns and meets all EPA and N…

    £59.99
    RRP: £67.99 | Save: £8.00
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  • HydroBlu Versa Flow Lightweight Water Filter HydroBlu Versa Flow Lightweight Water Filter
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    HydroBlu

    Versa Flow Lightweight Water Filter

    Weighs
    54g
    Weighs:
    54g

    UOG TOP PICK - The Versa Flow is a highly effective, versatile and lightweight filter. It weighs just 54g and can screw onto bottles, be used as a straw, be used for in-line and gravity filters to clean water and keep you safe- We've singled out …

    £32.99
    RRP: £32.99
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  • Pure Clear Collapsible Squeeze Water Filter Bottle Pure Clear Collapsible Squeeze Water Filter Bottle
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    Pure Clear

    Collapsible Squeeze Water Filter Bottle - Bottle

    Weighs
    56g
    Weighs:
    56g

    A Collapsible Water Filter that can filter 99.9999% of bacteria AND viruses. Pure Clear says:  Tired of carrying around your water bottle when it is empty or having to squeeze it back into your bag when there is no more room? Pure Clear®...

    £29.99
    RRP: £29.99
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  • Katadyn BeFree Water Filtration System 0.6L Katadyn BeFree Water Filtration System 0.6L
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    Katadyn

    BeFree Water Filtration System 0.6L

    Weighs
    59g
    Eco Initiatives:
    BPA Free
    Weighs:
    59g

    UOG TOP PICK - Katadyn's BeFree Filter - We've singled out Katadyn's BeFree Filter as one of our top recommendations because it's very lightweight, compact, collapsible and has a fast flowrate. It's a simple design but it works really well. It's idea…

    £47.99
    RRP: £49.99 | Save: £2.00
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  • Hydrapak 28mm Inline Filter Hydrapak 28mm Inline Filter
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    Hydrapak

    28mm Inline Filter

    Weighs
    62g
    Weighs:
    62g

    A lightweight and compact filter that connects to any 28mm water bottle or flask. The Inline Filter can also be incorporated into a HydraPak bladder system. Hydrapak says:  Access potable water anywhere. Our unique and versatile 28MM inline fil…

    £38.99
    RRP: £41.99 | Save: £3.00
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  • Katadyn BeFree Water Filtration System 1L Katadyn BeFree Water Filtration System 1L
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    Katadyn

    BeFree Water Filtration System 1L

    Weighs
    62g
    Eco Initiatives:
    BPA Free
    Weighs:
    62g

    UOG TOP PICK - Katadyn's BeFree Filter - We've singled out Katadyn's BeFree Filter as one of our top recommendations because it's very lightweight, compact, collapsible and has a fast flowrate. It's a simple design but it works really well. It's idea…

    £57.99
    RRP: £59.99 | Save: £2.00
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  • Currently out of stock
    Steripen Fits-All Filter

    Steripen

    Fits-All Filter

    Weighs
    65g
    Weighs:
    65g

    The SteriPEN Fits-All Filter effectively removes particulates from water with the use of a durable 4x4 micron screen. Its unique design, featuring the filter cup and funnel fit, offers flexibility to filter water into bottles with a wide range o…

    £29.99
    RRP: £29.99
  • LifeStraw GO Replacement Membrane Microfilter LifeStraw GO Replacement Membrane Microfilter
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    LifeStraw

    GO Replacement Membrane Microfilter

    Weighs
    68g
    Weighs:
    68g

    Replacement water filter compatible with all LifeStraw Go 2 series water bottles purchased 2023 or later. Not compatible with earlier models that feature the flip-up mouthpiece and carabiner attachment. Lifestraw says Protects against bacteria (inclu…

    £16.99
    RRP: £23.99 | Save: £7.00
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  • LifeStraw Peak Series Personal Water Filter Straw LifeStraw Peak Series Personal Water Filter Straw

    LifeStraw

    Peak Series Personal Water Filter Straw

    Weighs
    68g
    Weighs:
    68g (excluding bag)

    Fill up a water bottle and drink as you go, or drink straight from the source with the Peak Series Personal Water Filter Straw. LifeStraw says:  We took the most popular outdoor water filtration device on the market, and reimagined it for added.…

    £29.99
    RRP: £29.99
  • Currently out of stock
    Platypus QuickDraw Microfilter Platypus QuickDraw Microfilter

    Platypus

    QuickDraw Microfilter

    Weighs
    68g
    Weighs:
    68g

    UOG TOP PICK - QuickDraw Microfilter - Thoughtfully designed by experts in hydration, the QuickDraw features an attached clean side cap for an always-clean drink interface, while the durable RF-welded reservoir has a wide mouth for rapid filling at a…

    £44.99
    RRP: £49.99 | Save: £5.00
  • Steripen Ultralight UV Water Purifier Steripen Ultralight UV Water Purifier
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    Steripen

    Ultralight UV Water Purifier

    Weighs
    70g
    Weighs:
    70g

    A compact UV water purifier perfect for travel, emergency preparedness or anytime. It's easy to use with water activated programming and produces 1 liter of purified water in 90 seconds. Steripen says A pocket-sized water purifier for any advent…

    £99.99
    RRP: £109.99 | Save: £10.00
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  • MSR Hyperflow MicroFilter Replacement Cartridge MSR Hyperflow MicroFilter Replacement Cartridge
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    MSR

    Hyperflow MicroFilter Replacement Cartridge

    Weighs
    70g
    Weighs:
    70g

    The HyperFlow utilizes the latest Hollow Fiber Technology in a package so small and so easy to use it will change the way you travel in the backcountry. MSR says: Restore flow rates in your HyperFlow Microfilter with fresh, new Hollow Fiber media...

    £58.99
    RRP: £69.99 | Save: £11.00
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  • MSR Thru-Link In-Line Microfilter MSR Thru-Link In-Line Microfilter
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    MSR

    Thru-Link In-Line Microfilter

    Weighs
    71g
    Weighs:
    71g

    MSR’s Thru-Link inline filter turns your hydration reservoir into a filtration system, giving you clean water on the go. Ultralight and rugged, this little filter quick-connects into any reservoir system and lets you filter as you drink and hik…

    £63.99
    RRP: £74.99 | Save: £11.00
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  • Platypus Gravityworks Replacement Hose Kit
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    Platypus

    Gravityworks Replacement Hose Kit

    Weighs
    73g
    Weighs:
    73g

    Taste-free replacement hoses, fittings and clamps for any GravityWorks system. Platypus says: Easily replace old or damaged hoses and parts with these kits for either the 4.0L or 2.0L GravityWorks water filter systems. Kits include clean and dirty..…

    £24.99
    RRP: £24.99
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  • Pure Clear Collapsible Squeeze Water Filter Bottle - 1000ml Pure Clear Collapsible Squeeze Water Filter Bottle - 1000ml
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    Pure Clear

    Collapsible Squeeze Water Filter Bottle - 1000ml

    Weighs
    74g
    Weighs:
    74g

    A Collapsible Water Filter that can filter 99.9999% of bacteria AND viruses. Pure Clear says:  Tired of carrying around your water bottle when it is empty or having to squeeze it back into your bag when there is no more room? Pure Clear®...

    £39.99
    RRP: £39.99
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  • Sawyer International 64oz Squeezable Pouch - Set of 2
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    Sawyer International

    64oz Squeezable Pouch - Set of 2

    Weighs
    74g
    Weighs:
    74g
    Capacity:
    1900ml

    If you're in need of replacements or you like planning ahead and being able to carry more water with your Sawyer Point One or Mini filters, these extra pouches are ideal. Sawyer International says Add more water carrying capacity to your Sawyer wat…

    £11.99
    RRP: £13.99 | Save: £2.00
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  • Currently out of stock
    Sawyer International Micro Squeeze Water Filtration System Sawyer International Micro Squeeze Water Filtration System

    Sawyer International

    Micro Squeeze Water Filtration System

    Weighs
    78g
    Weighs:
    78g

    UOG TOP PICK -The Micro Squeeze Water Filtration System is an adaptable and super light weight system to keep you hydrated with peace of mind and tummy whatever your water source- its an easy top pick for us! Sawyer says Enjoy clean and safe drinki…

    £46.99
    RRP: £49.99 | Save: £3.00
  • Lifesystems Chlorine Dioxide Droplets Lifesystems Chlorine Dioxide Droplets
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    Lifesystems

    Chlorine Dioxide Droplets

    Weighs
    80g
    Weighs:
    80g

    Chemical water purification drops.  Lifesystems says:  These water purification drops kill bacteria, viruses and cysts in water including Giardia and Cryptosporidium. Chlorine dioxide is the safest and most effective form of chemical water.…

    £9.99
    RRP: £9.99
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  • Quickdraw Filter Quickdraw Filter

    Platypus

    Quickdraw Filter

    Weighs
    81g
    Weighs:
    81g

    We're working out what we think - we'll add our view here!  Platypus says:  Improve your backcountry filtering experience with the do-it-all QuickDraw Filter. Hollow fiber technology allows the QuickDraw to filter water fast (3L/m) while...

    £45.99
    RRP: £49.99 | Save: £4.00
  • Sawyer International 32oz Squeezable Pouch - Set of 3
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    Sawyer International

    32oz Squeezable Pouch - Set of 3

    Weighs
    84g
    Weighs:
    84g
    Capacity:
    940ml

    If you're in need of replacements or you like planning ahead and being able to carry more water with your Sawyer Point One or Mini filters, these extra pouches are ideal. Sawyer International says Add more water carrying capacity to your Sawyer wat…

    £13.99
    RRP: £13.99
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  • Pure Clear Life Filter Personal Survival Straw Pure Clear Life Filter Personal Survival Straw

    Pure Clear

    Life Filter Personal Survival Straw

    Weighs
    86g
    Weighs:
    86g
    weight based on:
    excluding bag

    A screw-on filter that filters 99.9999% of bacteria AND viruses. Pure Clear says:  The Pure Clear® - Life Filter® has been designed for rehydration anywhere, anytime. The Life Filter® offers its users clean safe filtered drinking wa…

    £25.99
    RRP: £25.99
  • HydroBlu Versa Flow with Activated Carbon Filter HydroBlu Versa Flow with Activated Carbon Filter
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    HydroBlu

    Versa Flow with Activated Carbon Filter

    Weighs
    90g
    Weighs:
    90g

    The Versa Flow is a highly effective, versatile and lightweight filter set with both hollow fibre and activated carbon protection. Weighing just 90g it can screw onto bottles, be used for in-line and gravity filters to clean water and keep you safe..…

    £41.99
    RRP: £41.99
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  • Currently out of stock
    Classic 3 UV Water Purifier Classic 3 UV Water Purifier

    Steripen

    Classic 3 UV Water Purifier

    Weighs
    92g
    Weighs:
    92g

    We're working out what we think - we'll add our view here! Steripen says: The Steripen Classic 3 with 40-micron pre-filter is the latest, most versatile model in our award winning line. Winner of Time Magazine's Best Invention of 2001, it offers...

    £89.99
    RRP: £94.99 | Save: £5.00
  • Sawyer International Mini Filter Sawyer International Mini Filter

    Sawyer International

    Mini Filter

    Weighs
    97g
    Weighs:
    97g (complete kit)

    The Sawyer Mini Filter is extremely light and can be used to filter water in a variety of ways including sucking straight from the source. Backflushing is straight forward and easy. Sawyer says:  “A lifetime of water at hand.” Our mo…

    £39.99
    RRP: £44.99 | Save: £5.00
  • MSR Miniworks/Waterworks EX Ceramic Element
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    MSR

    Miniworks/Waterworks EX Ceramic Element

    Weighs
    107g
    Weighs:
    107g

    The MSR MiniWorks/WaterWorks Ceramic Element alows you to revamp your filter or provides increased flow rate for an older model. MSR says Replacement ceramic filter element for both MiniWorks and WaterWorks microfilters provides increased flow rates…

    £52.99
    RRP: £62.99 | Save: £10.00
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