Ditch the filter, especially if you carry a light weight stove. If you need to get water from a wild source, boil it. That treatment is the most effective, anyway. I have done this, and it works fine. Adequate treatment is achieved by bringing water to a rolling boil and then using.

It is important to be sure you have the ability to carry large amounts of water when traversing arid/hot stretches. I have carried up to eight liters.