How long does it take to purify a canteen of water using Iodine tablets?

The correct duration to purify a canteen of water using iodine tablets is typically around 30 minutes. This time frame allows the iodine sufficient time to effectively kill harmful microorganisms in the water, making it safe for consumption.

It’s important to follow the instructions provided with the iodine tablets regarding the specific volume of water and the concentration of iodine, as this can impact the purification process. After the recommended waiting period, the water should be visibly clear and have the faint taste of iodine, which indicates that the purification process has been completed successfully.

Given the variations in other choices, such as 15, 20, and 25 minutes, those durations do not allow enough time for the iodine to work effectively. Insufficient time can result in inadequate purification, potentially leaving harmful pathogens in the water, which can pose health risks.