Additional Details ------------------------------ Product description: The concentrated 30ml solution is suitable for microdermabrasion, hydra beauty and hydra facial machine. A bottle of 30ml must be diluted with 370ml to 770ml depending on the desired concentration, so that the starting base contains between 400ml to 800ml. How to use Each bottle of 30ml can be used with water into 800 ml. The data prove that half bottle of 15 ml can be used with water into 400 ml (effect is OK).