I missed the 0.02 micron filtration in the bulb and bucket lifestraw system. The post by EMP certainly makes sense. Here's what really trips me over; I blew $350 on a Micro ceramic filter a year ago, and now I am thinking I am going to have to get rid of it and buy some more Sawyers.

I also bought one of the bigger Sawyer filters, it claims 1,000,000 gallon life. I could set up my own water processing plant with one of those.