All bath salts are similar in their creation, with different ingredients added for fragrance and remedial properties.
Epson salts are an excellent remedy for drawing out impurities and to relax muscle tension.

base ingredients
1 cup of epson salt
2 tsp of organic corn starch

floral add ins:
2 tbsp of your favorite dried/fresh flower/leaf (rose petals, orris root, lavender pedals, chamomile, marigold, etc)

essential oil add ins:
4 drops of your favorite essential oil, i.e. lavender, geranium, orange, etc.

citrus add ins:
1/2 cup of peeled or sliced citrus (orange, lemon, grapefruit, tangerine, line, etc.)

fizzy add ins:
2 tbsp of baking soda
Adding baking soda can breakdown oily skin and assist in restoring the ph levels of your skin.

to make
Mix all ingredients, along with a selection of the above. If you are adding essential oils make sure it is thoroughly dispersed. The corn starch softens the skin and holds the other ingredients together.

to use
Add the desired amount of salts to your bath.