- Mix the baking soda, soda crystals, citric acid and coarse salt in a bowl, and using a sprayer, moisten your 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.
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