28 Jan 2010
The world needs to know that hand sanitizer is not a substitute for washing your hands. If you pick through a pile of poo then use hand sanitizer, all you have is sanitized poo on your hands. You still need to wash them.
The principle holds when considering filters and boiling water. If you have an iffy water source and you just boil your water, all you have is sanitized dirty water. If you don't want to drink dirt, you need to filter it, too.