I would place water treatment into two catagories. One to filter out crud and two to kill partistes.
When hiking in low elevation areas I ususualy carry a filter. I too use the sweet water filter. THough I have broken it before and it has left em without water.
When hiking at hiker elevations when the water will msot likey be free of cows dropping their loads I use polar pure. It is iodine, but you pour in an iodine solution. There is solid iodine balls, looks like bb's, you add water and make the solution in the bottle. Pour out as many cap fulls as the water temps determines the solutions concentration. I also evaluate the waters purity and consider how many cap fulls to fill. This is a great way to chemicily treat your water as it leaves very little bad taste.
This is what I carry if I am traveling to countries of questionable water quaqlity. THough if I am in such a country I will jsut buy bottled water.