It's easy to make your own medicinal salt. The process involves finding a water treatment plant, harvesting its treated water output (effluent), building simple salt evaporation ponds, and collecting the dried sea salt.
What you need:
a local water treatment plant
4 x 5 gallon buckets
wood: two 10ft 2x6"s for the length and two 6ft 2"x6" boards. We made 3 ponds, but one will suffice.
At least 35 square feet of 3mil - 6mil plastic sheet or heavy-duty pond lining (any color, but black will generate the most heat, which is good for evaporation)
staple gun and staples (3/8", 10mm)
1" wood screws
steel corner braces.
black gaffers tape
For more information on the salt we make go to All-Salt.com
Step 1: Find a Source
Find out where your local wastewater treatment plant drains its treated wastewater - usually to a nearby stream or reservoir, lake or river, beach, or bay. This information may be on the plant's website, but you may also need to call to ask. You can also uses Google maps' satellite view to see a plant's treatment facilities and grounds in order to locate drainage channels or sloughs coming from the plant.
We found our source in San Jose, CA on the Artesian Slough that comes from the San Jose/Santa Clara Water Pollution Control Plant.