Cosmetics Formulation Development

I want a recipe for making a bubble bath for a normal bathtub. I want a lot of bubbles And without sls, it can be in powder or gel form. and if not กันเสีย Is it good because it's for your own use or is it necessary? yes If used, which one should I use? Please advise. Thank you.

Hello, the product is a powder or lump, is that right? It is recommended to use Clarify-Wash™ Powder acts as a สารชะล้าง of the formula.