I purchased some already made bath salts and they do not bubble. The ingredients list is: sea salt, vegetable glycerin, cosmetic grade/manufacturers fragrance oil, FD&C approved colorant, and vitamin E. Is it okay to add either citric acid and/or Sodium Lauryl Sulfoacetate (SLSa) to the already made salts? I have never used either of these. If it is okay to use them, do I need both for the bubbles or just one? I read to use 1-3 percent of the SLSa, but could not find how much of the citric acid per pound of salts? Thank you.