> "As far as "condemning" Sierra water, when did I do that?"

The following is what hit me. You had giardia once, so therefore you filter Sierra water.

> "but having had giardia before (I got it on a surf trip to Baja California in the 90's), I decided to filter water."

This is no big deal, and I apologize if people feel I am belaboring the issue. But I just felt the need to underscore that there is no factual evidence that anyone needs to treat the water.

BTW, I've had giardia once, too, and I don't filter Sierra water. My only giardia attack was at the end of a 4-day trip (too soon to have contracted it from the water).