[pct-l] filter necessary, or just iodine?

[mgeis@yahoo.com (Matt Geis)]

Are there water conditions out there on the trail that will necessitate a
filter?  In all my days backpacking, I've never had problems just using
iodine.  Any success/failure stories out there by people who decided to
forgo the filter and just treat with iodine?  I was considering using a
bandana to act as a "solid-materials" (i.e., scum) filter.

Thanks,
Matt