Salts are ok. Oil can make a messy emulsion but I sometimes put up to 10 DROPS of tea tree oil, not enough do mess up the solution but a small amount is a good fundicide for the tub (and I love the smell).
By deafaspoopoo on December 15, 2013
I have added salt to my foot bath before with no clogging problems although I will say that when I empty it out I give it a few extra rinse outs because it has had salt in it. Salt can be hard on the motor if not cleaned well after use.
By me in mass on February 7, 2014
I don't think it has any real medical benefits, but putting a few drops of lavender oil, or ginger oil, or mint oil, into the Foot Spa makes me happy, because it smells so nice !
By Pilot Girl on July 15, 2016