Fill about 1/4 of the glass container with Himalayan salt.
Add the water until about two inches remain free at the top.
Place the lid on top and gently shake the container. Let the glass container sit overnight to allow the salt to dissolve.
If salt remains at the bottom of the jar the next day, the water has absorbed the maximum amount of salt and the sole is ready.
Otherwise, add salt to the water again and continue to do so if no salt remains at the bottom again the next day.