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![28mm Filter Kit](http://hydrapak.com/cdn/shop/products/HP23_inline_filter_front_WebRes.png?v=1674506356&width=500)
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We offer free shipping on all US orders where the subtotal is $45 or greater!
We are happy to offer a 30 day return policy/satisfaction guarantee. If, for whatever reason, you are not happy we will exchange or refund your purchase.
If you experience any failures due to the product's manufacturing or materials, we'll repair or replace the item for free.
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Product Details
Access potable water anywhere. Our unique and versatile 28MM inline filter threads directly onto popular 28MM opening bottles and flasks and is equally easy to install in any of our reservoirs and caps with a Plug-N-Play™ connect system. This versatile connectivity makes our filter a great backcountry water treatment solution whether you are squeezing your water from a Stow into another bottle, gravity filtering your water out of a Seeker or Pioneer water storage bag or filtering as you drink on the go from a Stow or HydraPak reservoir.
Features
![](http://hydrapak.com/cdn/shop/files/28mm_Filter.png?v=1708016421&width=800)
![](http://hydrapak.com/cdn/shop/files/28MM_THREAD.png?v=1708017964&width=450)
Easily thread the filter onto some of the most popular backpacking bottles and flasks including the HydraPak Stow 500ML and 1L and the 1L Smart Water Bottle.
![](http://hydrapak.com/cdn/shop/files/PLUGNPLAY_277ee410-a646-4c64-99b2-d5bb8c8e22a6.png?v=1708017970&width=450)
Easily connect and disconnect the filter from the Plug-N-Play ports in reservoirs and caps.
![](http://hydrapak.com/cdn/shop/files/FAST_SAFE.png?v=1708017976&width=450)
The integrated filter removes Escherichia coli bacteria, Cryptosporidium parvum cysts, and Giardia Lamblia from approximately 1,500 liters of water at a rate of >1L per minute*.
* Effectively removes common waterborne bacteria, such asE.coli (99.9999%), and parasitic cysts (99.9999%) per NSF 42.
![](http://hydrapak.com/cdn/shop/files/CAP_ADAPTER.png?v=1708018007&width=450)
Plugs into filter outlet allowing user to thread on their Stow or Smart Water™ Bottle cap.
![](http://hydrapak.com/cdn/shop/files/BACKFLUSH.png?v=1708018014&width=450)
Plugs into filter outlet and threads onto a HydraPak Stow or bottle of clean water for backflushing the filter in order to restore its flow rate.