>>2729776With proper backflushing/maintenance they should be okay. Katadyn Hiker pro has a removable filter protector that you can clean with the provided sponge in order to prolonge the life of the cartridge. If you prefer to run a bit cleaner water trough your filter, you can prefilter the water with a water filter bag first and then run it trough a dedicated filter.
Picrel is sold by helikon-tex and costs about 11€, fits 3 litres and takes some time to run the water trough. It can be used for only removing mud and sediment from the water. Running the water trough that and boiling it afterwards gives you clean enough water for consumption, as long as there won't be chemicals or heavy metals in the water. Originally used by British troops during WW2.
Using a filter bag and a hollow fibre filter feels a bit redundant to me and I wouldn't carry one but I am posting about it because I wanted to tell you about some options.
