How long does this last?i use a katadyn Hiker ,works great,and not to bad on the pocket book 60$ there are others out there that cost more...some that cost less...it's all comes down to what u like best...i also carry aqua tabs as backup or for water that i feel the filter will cut it.
You can get a Katadyn Combi off ebay for a little over $100. It can be used both in the field and in the home with the faucet attachment. The Combi will purify 13000 gallons .I am just concerned with any small pump for a whole family. I just wonder how many pumps and how long a stop for 7 people to refill. That's why I was inclined to look at the gravity filtration systems.