Boiling vs filtering for purifying water in survival situations?

Choosing the Right Method

When selecting a water purification method, consider the available equipment, environmental conditions, and the type of contaminants present in the water. Boiling is the most universal method, suitable for most survival situations, but it requires a heat source and a pot. Filtering, on the other hand, is a faster and more energy-efficient option, but it may not be effective against all types of contaminants.

Effectiveness of Boiling and Filtering

Boiling water is effective against 99.9% of all bacteria, viruses, and parasites, making it a reliable option for purifying water. Filtering, when combined with boiling, can remove particulate matter, sediment, and some bacteria, but it may not eliminate all viruses and parasites. For example, a water filter with a 0.2-micron pore size can remove up to 99% of bacteria and 95% of viruses, but it may not be effective against Cryptosporidium and Giardia.