Having spent half of last week trudging uphill to be sure that I was above the local dead sheep population, it occurs to me that I should probably get a water filter. I used to use a Millbank Bag, which was bomb-proof although slow (and I was always leery of remaining on iodine for too long) however this seems to have walked. In any event, I'm sure that there are better solutions out there . Any recomendations gratefully received. Am a civi now, so can't get anything through the system. PB.