crypto dwell time seems very long in comparison to iodine or chlorine based treatments. Filtering is much faster and this item is about the same weight as a light ceramic filter. Filter can treat a much larger volume of water and it is ready to drink in 1 min vs 4 hours.

The dwell time may be accurate but not what I'm interested in waiting for while I am refilling my canteen during an evacuation walk-out. If at a temporary shelter situation I would presume better preparations. If I am going to be carrying something EDC for my PSK or similar - I would want something smaller and lighter - Iodine tabs work for me. Further I wouldn't want to add yet another battery powered device to fail from lack of power under emergency or survival situation.