Fill a kettle with 0.5 L of water. Mix in 1/2 of a sachet of citric acid and set on the heat. After the solution reaches a boil, leave in the kettle for 15 minutes
½ of a sachet of Household Citric Acid
0.5 L of water
Fill a kettle with 0.5 L of water. Mix in 1/2 of a sachet of citric acid and set on the heat. After the solution reaches a boil, leave in the kettle for 15 minutes, and then pour out the solution. Next, boil and drain fresh water from the kettle at least 2-3 times.