Indigenous to certain areas. May not be an issue in Denali. I don't know. Specifically, ask the Rangers about Hydatid tapeworms or Echinococcus granulosus (one of at least two in the genus which can be a problem for humans). These tiny critters are the real bad boys of the tapeworms.
A rolling boil for AT LEAST 2 MINUTES is the minimum recommended boiling time to kill tapeworm eggs.
Some spore forming bacteria can survive even longer periods of boiling, but we generally are NOT concerned about these little buggers since they are generally found in soil and not water. I won't get more specific here unless someone wants me to.
This is very fuel inefficient. Depending upon how long you are planning to be there, the wt. of your filter (11oz? 16oz?) may end up weighing less, initially, than your extra fuel - of course this is just until you consume some of the fuel. Also, you can drink immediately, rather than turning a water stop into a more complicated boiling operation.
The filter has one other advantage. What would happen if you ran out of fuel? Perhaps a leak, or a spill. Now, if boiling is the only means you have with you for purifying water, AND IF "tapes" are an issue, how would you purify the water?
Your filter will work fine if you have an absolute 0.2 micron filter. Actually, I believe a bit larger pore size will work also, but 0.2 micron is a common size for some ceramic filters.
Normally, I would just use Aqua Mira to purify the water. However, if tapeworms are a potential problem, then I would first filter b/f treating with AqM.
Hope this info helps.