I'm not entirely convinced by the BPA is an immediate threat toxin,
It's not a question of whether BPA _can_ be a threat but rather dosages in water bottle usage. As Blast pointed out, when there are *eleven* zeros to the right of the decimal point it's time to start asking questions.
If you ate the water bottle then the dosage levels might be more problematic...
From Rick Ridgeway, Patagonia's VP of Environmental Initiatives:
It would be interesting to hear Sigg's side of the story, and whether the Patagonia Procurement team actually specified BPA-free or not. The "VP of Environmental Initiatives" may want it but Procurement may not bother asking for it - after all, Procurement guys are paid to filter out unnecessary specs that add costs. That's been my experience in the corporate world anyway.
Having used them, my only concern (recently mind you) is sub-freezing temps and the filter itself freezing up.
Agreed - what is the risk that a 1 micron filter silently becomes a 10 millimeter filter after freezing?
Unless it's possible - and cheap - to buy a water solution with 5 -to 15 micron particles suspend I'm not sure how to test a filter.
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