Originally Posted By Talthing
... it's the chemicals I'm worried about (Hepititus, pharmaceuticals, etc). ... I use the MSR Sweetwater filter and back it with the MSR purification drops....


Your system does nothing for chemical contamination. The filter is ineffective against viruses (like hepatitis), but the steripen is effective.

If you are worried about chemicals you probably have to distil the water.... or treat with activated carbon, though I have yet to find research that shows the effectivity of activated carbon in portable systems to treat water.