After many years of wishing we could have a hot tub to deal with our back issues but not being able to due to skin sensitivities and chemical reactions to harsh products. We are so excited to report we can now use a hot tub daily without adverse affects thanks to the gentle SilkBalance formula. It is so simple to use and wonderful not to come out peeling and smelling of chlorine. Looking forward to winter nights relaxing under the northern stars surrounded by snow.