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All cartridges (HF20/25-HF90/95) reduce sediment, chlorine taste and odor, and scale. All fractional micron filters (HF20-HF90) reduce cysts including oocysts of cryptosporidium and toxoplasma and cysts of giardia and entomoeba as tested by manufacturer. Except HF20 the fractional microns also reduce E.Coli ATCC (11229) as tested by 3M; (not tested or certified by NSF)