A robust and portable water filter and purifier capable of filtering 20,000 litres of water, from which it instantly removes viruses, micro-organisms and bacteria. The LifeSaver CANYSTER 20K holds up to 18.5 litres. Ideal for a larger group of people. e.g. on expeditions. Compatible with car canister racks. Also a great source of drinking water for the entire household in an emergency.