I have a Katadyn Pocket Filter to get rid of bacteria and protozoa and to compliment it I have a Katadyn activated carbon pre filter that fits in the outlet hose of the KP to get rid of a lot of the chemicals and bad tastes. I really like the combination and it has worked extremely well thus far and surpassed my expectations.

The Katadyn Pocket may seem exorbitant, especially where replacement ceramic filters are concerned, but its lifespan is extremely long in comparison to a lot of other filters.

You can get the Katadyn Pocket for $159.99 from Amazon (Free Shipping). Right now Amazon also has a deal on replacement ceramic cartridges as well ($79.99).

I am also thinking about buying a SteriPen. Does anyone have any experience with these?