Premac Travel Well Pocket

This water purifier weighs just 60g; exceptionally compact; removes viruses without additional iodine. But 0.2 litre per minute flow rate is very slow; only 60 litre capacity then have to buy complete new unit (£22); strong iodine taste after use; input pipe tends to float too easily on surface of water; can’t screw to water bottle.

Verdict: Buy it if you want a compact unit that kills viruses for occasional use, as regular use would be expensive.