What are the three methods of purifying water in the field?

The correct answer identifies three effective methods that can be utilized in the field for purifying water: boiling, iodine tablets, and bleach.

Boiling is a well-established method of water purification that eliminates most pathogens by subjecting water to high temperatures. By bringing water to a rolling boil for at least one minute (or three minutes at higher altitudes), it is ensured that harmful bacteria, viruses, and protozoa are killed, making the water safe for consumption.

Iodine tablets are a convenient option for on-the-go purification. When dissolved in water, these tablets release iodine, which has antimicrobial properties that effectively target and kill pathogens, although it is less effective against some protozoa in certain conditions. This method is favored for its portability and ease of use in emergency situations or extended field operations.

Bleach is another effective method. By using household bleach that contains sodium hypochlorite, you can kill bacteria and viruses in the water. It is important to use the correct dosage and allow sufficient contact time for the bleach to work effectively. Like iodine, bleach is useful for situations where water sources may be contaminated.

Comparatively, choices that include water purifying tablets or reverse osmosis are less common in traditional field settings, where boiling