They shade the micron filter level in the description (these are 10 micron filters). Basically, it just filters out dirt and rust. It will NOT filter out 97% of the chlorine or improve the taste like they claim. Spring. it's not for me anyway. 3 of these filters in a 3 filter box lasted about 3 weeks before the water was back to normal tap water quality. This is mostly good as the pre-filter is what I end up using with the remaining 3.
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