Regarding Filters -
Most of the time they work, and continue to work, as advertised. But on my last trip, pumping "optically clear" water, the Hiker Pro gave it up. There was no forewarning.
On Day 4 it just became incredibly hard to pump. I was on a 5 day hike, but if it had been a 10 day hike it would have been a real struggle to pump water. Including this trip, we had run less than 50 gallons through the filter. (It is rated for a nominal 200 gallons.)
I called Katadyn customer service and they said "Yep - It Happens". Apparently there both sediments and algae that are not "visible" but readily clog the filter.
I have used a Hike Pro for years and years and this was a first.
Much as I dislike it, I'll now be taking something as a backup, "just in case".