Mix the baking soda, soda crystals, citric acid and coarse salt in a bowl, and using a spraver. moisten vour mixture with a little water, while stirring.
Continue adding water until you obtain a compact powdery texture. Then, fill the compartments of your ice cube tray with this mixture and pack it well to have compact tablets.
Let it sit for 24 hours in the fridge and then turn the ice cube tray over to loosen your tablets.
