Do the people that use this system trust the water as drinkable when complete or should further treatment like Steripen or tablets be used? Also how many liter uses is the filter supposed to be viable?

I do not live in the US or Western Europe and I've never used a secondary purification system and haven't gotten sick from this filter. If you're really worried, just buy a viral-guard cartridge and add it to the hose as another in-line filter.

If your worried about the water you are filtering then I would suggest the Sawyer 4L .02 micron gravity filter. Its about 70 dollars more but its filter is guaranteed for 1 million gallons and it purifies rather than filter.

In The continental US and in developed countries there is no need to worry about virus' in the water- lakes,streams, ponds creeks etc. We have treated waste plants and medications that help infected ppl. In 3rd world countries where no waste treatment is available and very few medications available virus' will be more prevalent

Jim, That is a general question to anyone using a pump filter system. I've never had to use a secondary filter or purify any further. I only filter mountain stream water, above 9,000 ft, & have never been sick either. When above 12,000 ft I don't filter @ all in clean moving streams or water coming directly out of rocks. If you're trying to kill/remove viruses, you'll have to use a purifying system like the SteriPen, First Need, chlorine dioxide tablets, Polar Pure, etc.

Jeff is that a question to me or others? (Do the people that use a pump filter system further treat their water with a "SteriPen" or tablets?) I would tend to trust the water after filtering rather than not especially in some of the mountain streams I would use (I have also never been sick from water) however a video I watched does say that it does not filter virus so just curious how concerned I should be with further treatment.

I've been using this system all summer with very positive results. I trust it just as much as a pump filter. Look @ it this way, gravity is gently moving the water through the filter rather than me forcing it through with a pump. Do the people that use a pump filter system further treat their water with a "SteriPen" or tablets? The filter element is good for an estimated 1500 liters.