In with the dirty out with the clean.
Pure Hydration has developed a Thirst Aid water bag that can clean
up to 350 litres of dirty water between each filter change. To use the
bag one simply opens the lid and fills the bag, shakes and leaves to sit
for 15 minutes. Then a gentle squeeze provides safe, clean drinking
water without chemicals, pumps or moving parts. The bag's filters,
which remove sediment, heavy metals, contaminants, pathogens, bacteria
and viruses, have been tested and approved by the London School of
Hygeine and Tropical Medicine, the London Hospital of Tropical Diseases,
Qinetiq and the governments of South Africa and Kenya. Under testing the
robust Thirst Aid bag has been run over repeatedly by a 2.5-tonne lorry
and survived unscathed.