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I would guess that the pore size of the Brita pitcher (if it even has a membrane filter in it) is too large to effectively filter out bacteria. My MSR MiniWorks EX microfilter has a pore size of .2 microns.
My response is based on consulting with my husband (chemical engineer) and my friend (environmental engineer), both of whom have taken classes in wastewater treatment.
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If I am not better, at least I am different. --Jean-Jacques Rousseau
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