The Soft Soak care system is a non-chlorine, non-bromine system that uses biguanide as its primary sanitizer and hydrogen peroxide as its oxidizer. It includes additional products like a conditioner and stain & scale control. Soft Soak is incompatible with chlorine, bromine, and certain other chemicals. The Soft Soak TRIo system can be used for indoor or outdoor spas that are covered or uncovered with average or high usage.