Good fit for Katadyn filter housing. But it doesn't filter nearly as well. I wouldn't recommend them as a replacement if you plan to use them on outdoor hikes where poor water quality is known. I only use this to filter rainwater in a non-electric cabin. I would not use them to purify water from a stream, river, pond etc unless you use an additional cleaning agent such as iodine tablets, UV light, chlorine etc.
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