Originally Posted By: MDinana
Given it's a bacterium, that's between 5-15 microns in length, your standard water filters should deal with it just fine. If I recall, a lot of "good" filters get down to 0.2 microns, so you're golden.


Careful. I'm no expert on lepto so take this with a grain of salt, but I just looked it up and although they may be 5-15 microns in length, they're only 0.1-0.3 microns in diameter. The look like long, thin strings. They also have internal flagellae that allow them to twist and burrow into tissue, so they can actually burrow their way through the pores of a filter.
Here's a link to the lepto brochure by the Hawaii Deptartment of Health. They suggest boiling or chemical treatment since filters may not be effective.