Originally Posted By Canyonero
It may depend on the cartridge. I took my Katadin Mini (ceramic) filter out recently after a similar layoff. I checked the manual, and it says there's no limit on the shelf life. The criteria to replace it is when filtering slows down even after cleaning. I think the total capacity is over a couple thousand gallons.


I think you'll know for sure it isn't good anymore when after drinking the filtered water, you feel some rumbling in your lower abdominal region, followed by...

In all seriousness, I do not believe there is a shelf-life on my filter that is listed either but it might depend on how much use and what kind of use it went through prior to having a layoff. If you cleaned it and/or replaced the cartidge as needed, it should be fine. My father's filter sat for over 5 years between uses and it still performed as it was designed.
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