Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to soften hard water naturally [title] Boil away impurities. [step] If your water contains a lot of minerals, especially calcium, you can remedy the unpleasant taste by boiling the water before drinking. Fill a clean pot or kettle with water and place it on a stove burner set to high.

Ending1: Allow the water to boil for a few minutes. [substeps] If you aren't sure if your water is hard, or if you want more specific information about the minerals in your water, test it with water hardness testing strips. Ending2: Turn the burner to high and allow the water to come to a boil. Once the water comes to a boil, turn off the heat and remove the pot or burner from the heat. Ending3: [substeps] Hot water is not as effective as cold water, so heat it a bit at a time. Do not over-boil the water, and avoid stirring constantly. Ending4: Turn the burner to the high setting and place the pot on your stove. Wait a few minutes for the water to come to a simmer, then carefully turn off the heat and remove the pot.

Answer format: ending1/ending2/ending3/ending4