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The MiniWorks EX microfilter is the worldwide best-selling microfilter, delivering long-lasting, field-maintainable water filtration in demanding environments.
The MiniWorks EX microfilter is the worldwide best-selling microfilter, delivering long-lasting, field-maintainable water filtration in demanding environments.

MSR MiniWorks EX Microfilter

£126.00 £140.00 10% off
in Customer Rewards when you buy this item today

With Pre-Order, you can purchase the latest items added to our store in advance of them arriving with us.

Your Pre-Order is prioritised (at no additional charge); meaning that as soon as the product arrives with us, we can wrap it straight back up; ready for collection via Click & Collect or despatch to you — it often never even hits the stock room shelves!


With Pre-Launch, the date when we expect to receive the product ourselves is still a little too hazy to be confident in accepting Pre-Orders.

So, instead, you can submit your email address against the item you are interested in and we will email you as soon as stock arrives on the system.

Estimated Delivery & Collection Dates

Estimated Delivery & Collection Dates are given on Pre-Order and Pre-Launch products. They are for indication purposes only and can change at any time without notice.

The dates we provide are based on indications given by our suppliers. Whenever we get updated information from our suppliers we will endeavour to update the Estimated Delivery & Collection Dates provided on product pages.

We estimate this will be ready for despatch to you or collection via Click & Collect on Undetermined
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When you purchase this item, you will earn of rewards points to spend on your next purchase from us. You can spend your Rewards balance in-store & online.
Returns and Refunds

Online Returns Information:

  • In the event that your purchase is not suitable, for whatever reason, you have the right to return it to us.
  • Goods should be returned in new condition, unused, and with their original undamaged packaging.
  • We aim to process all returns within 72 hours. This may take slightly longer at busy times of the year. We will e-mail you once your return has been processed.
  • Any items returned will be refunded unless faulty or shipped in error.
  • If you wish to exchange an item for any reason, please place a new order for the items that you want.
  • Please note that it is your responsibility to pay for the return postage costs, no postage costs are refundable.
  • Goods may be returned for a refund within 30 days of receipt.
  • You do not need to contact us to notify us of your return unless the item is faulty or is outside of our 30-day policy.
  • Goods must be packaged securely to ensure they are not damaged in transit. The responsibility and liability of the goods remain with you until we are in receipt of the goods.
  • For health and safety reasons face masks cannot be returned for an exchange or refund.
  • Climbing & PPE Safety Equipment can only be returned on very strict conditions. Everything must be exactly as it was received, with packaging and labelling intact. If there is any sign or possibility that the goods have been used or contaminated then we regret that we are unable to accept a return on the grounds of consumer safety.
  • In the unlikely event that your purchase develops a fault, for whatever reason, then please contact us first either by telephone or email for further instructions. In the majority of cases, any faulty goods will have to be returned to us and then forwarded on to their respective suppliers for inspection. Please be aware that this process may take several weeks in some cases. Any postage costs paid will be refunded by THE CLIMBERS SHOP if a product is deemed as faulty and still under a manufacturer's warranty.
Goods Purchased In-Store:
  • If you purchased in-store and need to return an item by post please contact the relevant shop directly before sending.

How do I return an item?

  • Download our returns form from the link at the top of this page and once complete, enclose it with your return.
  • Ensure you include all tags with your return.
  • If possible, please include a copy of your receipt so we can process your return/exchange quickly.
  • Goods must be packaged securely to ensure they are not damaged in transit. The responsibility and liability of the goods remain with you until we receive the goods.
  • Please send your online return(s) to: Returns, Hooked on Granite Ltd, Capel Curig, Betws-y-Coed, LL24 0EN
  • In-Store purchases need to be returned to the shop they were purchased from.

MSR MiniWorks EX Microfilter




The MiniWorks EX microfilter is the worldwide best-selling microfilter, delivering long-lasting, field-maintainable water filtration in demanding environments.

Engineered for frequent and heavy use, it utilizes the workhorse Marathon™ EX carbon/ceramic element to ensure clean, reliable and taste-free water. Thanks to its innovative AirSpring Accumulator™, it’s capable of pumping one liter per minute and the flow rate can be renewed easily and repeatedly in the field—no tools required. It’s lightweight and compact and, most importantly, been proven reliable by thousands of adventurers just like you.


  • Testing: Meets NSF protocol P231 for removal of bacteria (99.9999%) and protozoa (99.9%) from beginning to end of filter life in “worst-case” water.
  • Reliable: Durable carbon/ceramic element ensures safe, taste-free water—even with frequent, heavy use.
  • Field-maintainable: Can be cleaned repeatedly for full filter recovery with no tools required.
  • Fast Flow: AirSpring Accumulator™ increases filtration speed; up to 1-liter per minute.
  • Better-tasting Water: Carbon core removes unpleasant tastes and odors caused by organic compounds, such as iodine, chlorine, and pesticides.

Water is critical for hydration but is likely one of the heaviest things we carry in the hills, so how do we carry all of that essential liquid to keep our bodies functioning and healthy? Our bodies are 60% water and if that level isn’t maintained our performance, recovery, and even our decision-making abilities can be affected.

Happily (unless you are in the desert) there is plenty of water for us to tap into while out and about but to ensure we can drink and cook food safely and to ensure our trips aren’t spent groaning with stomach cramps, we probably need to treat it……

What is the difference between a water filter, water purifier, UV and chemical treatment?
Can’t I just boil it?
What does gravity filtration mean?
Where is it best to get water from?
Are there waterborne diseases in the UK?
Why is it so hard to push water through my filter?
How do I look after my filter/purifier?

Top Tips To Make The Right Choice…..

Think about where you are heading and the type of water you will be treating – will it be clear but dodgy hotel tap water or glacier water carrying a heavy sedimentary load?

Next think about how much water you need to treat – is it for just you or a group? This will determine weight and size.

Don’t forget, that clean water is essential for washing wounds. Having a packet of chemical treatment tabs in your first aid kit could prove to be a lifesaver.

Technical Information
  • SKU:
  • Weight (Standard):
    1 lb
  • Weight (Metric):
    0.46 kg
  • Width (Standard):
    2.75 in
  • Width (Metric):
    7 cm
  • Length (Standard):
    7.5 in
  • Length (Metric):
    19 cm
  • Height (Standard):
    5.5 in
  • Effective against bacteria:
  • Effective against chemicals/toxins:
  • Effective against particulate:
  • Effective against protozoa:
  • Effective against viruses:
  • Filter media:
    Ceramic Plus Carbon
  • Filter pore size (microns):
  • Flow (L/min):
    1 liters per min
  • Flow (strokes per liter):
  • Cartridge life:
    ~2000 liters
  • Field cleanable:
  • Field maintainable:
  • Water Bottle Adapter:
  • Cartridge replacement indicator:
  • Material(s):
  • Country of Origin:
    Made in the U.S.A. of U.S. and Imported Materials
  • Mechanical advantage:
Sizing Information
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