taking water from a stream that I know is underneath grazing pastures
TBH this is the main use case I see for me. All of my hill walking/running is in the UK and that normally means sheep or cows grazing on the land above the streams. I think a bog drink would be a last resort.
I personally wouldn't use a filtration system to routinely drink that sort of water...its more of a precaution that I take for multi day trips where running out of water would be a real safety issue. Obvs my opinion might not be justified.
TBH this is the main use case I see for me. All of my hill walking/running is in the UK and that normally means sheep or cows grazing on the land above the streams. I think a bog drink would be a last resort.