Reply #11: I appeciate the personal experience. And, I caution about the websites:

[arendt]

From http://www.waterfiltercomparisons.com /

Who are the companies behind the products?
# Brita = Clorox Bleach Co./ Retail
# PUR = Recovery Engineering, Inc./ Retail
# Amway = Amway Inc./ Multi-Level Sales
# Culigan = U.S. Filter = Vavendi/ Retail
# Kenmore = Sears/ Retail
# Multi-Pure = MultiPure, Inc./ Multi-Level Sales
# Seagull IV = General Ecology/ Retail
# Aquasana = Sun Water Systems, Inc/ Factory Direct & Retail

...

This site is owned and operated by Doss Holdings Inc., a "For Profit" Texas Corporation owned by Charles, Mindy and Noah Strand. Charles Strand is also a shareholder and has affilaitions with Sun Water Systems, Inc.

As I said in the OP, I can't find much in the way of independent corroboration. Your experience is useful. And, the waterfiltercomparisons is also useful. I wish I weren't so skeptical of self-promoting green business-folk.

arendt