I think it is conventional to use coffee filters for prefitering. That should get all but very quite fine particles out.

Looking at the Geopress, basic specs are: 24 oz built-in bottle, costs $100, weight 450g, filters 5L/minute. There is a smaller version with 16oz bottle weighing 354g that does 3L/minute, and a 2L/minute 309g model, both of which cost a little less. The manufacturer website is grayl.com.

I had not heard of this before and it seems nicer than the old Katadyn and MSR stuff that I've looked at. Thanks!


Edited by paulr (03/24/22 11:01 PM)