I’ve had my spa for 7 years now and I have had trouble getting water to stay clean for any amount of time. I was so feed up with water troubles, I was about ready to get rid of the tub. Then I found silk balance it was my last attempt to save my spa. Silk balance is so easy to use and the water stays so clean and fresh smelling.Its been about 2 months now and I have never enjoyed my hot tub as much as I do now. Its great and we love it! Thank you John and Heather