Good morning guys. *sips coffee*
In one of my earlier replies to the thread about water, I mentioned that a carry a single canteen and a water filter. The water filter I usually carry is a Katadyn, although I have had experience using that very same MSR Miniworks.
Three problems with it, one is inherent to any and all water filters.
1) The MSR is EXTREMELY difficult to pump, the handle is bloody stiff, and too short for effective pumping. After humping around for eleven or twelve hours in the alpine, I found the MSR very tiring to pump. And it takes a long time to fill up a one litre canteen.
2) I have this same issue with the Katadyn I use. Inside the bag that you carry the filter in, be damn sure to take a green kitchen scrubby pad, the ones you use on pots and pans. Scotchbrite, I think they're called. As the filters are ceramic, the pores can become clogged with the bacteria and muck that you're filtering out of your drinking water. I recommend doing it this to your filter once a day, maybe more.
3) Unfortunately, I can't recommend you a good retailer, Trauma. Sorry.
And that's about all I have to write about the MSR Waterworks pump. Well, that and the filter pores getting clogged reminds me of Gore-Tex.
Cheers,
Adam