What is the first step in preparing a chlorination solution for a 5-gallon tank?

The correct answer involves adding a measured amount of chlorine to water. Specifically, adding a half gram spoon of chlorine is suitable for creating a chlorination solution that is safe and effective for disinfecting water. This step is crucial because it allows for controlled dosing of chlorine, which is important for ensuring that the solution achieves the desired concentration without becoming overly strong or corrosive.

Correctly measuring the amount of chlorine ensures that it will effectively kill pathogens while still being safe for human consumption. Moreover, diluting the chlorine in water before using it helps to evenly distribute the chlorine throughout the solution.

In comparison, adding larger amounts of chlorine, such as one tablespoon or one cup, could result in concentrations that are too high, which may cause health risks. Mixing water with salt does not directly pertain to preparing a chlorination solution and does not provide the necessary sanitation properties needed for effective disinfection.