We have used SilkBalance in our spa since the day we bought it a little over a year ago. I love how silky the water feels and how clean and clear the water looks. We have been on vacation in the past and gotten off schedule with our water treatments and we noticed a big difference in the water the next day after adding SilkBalance. We have friends who have a spa and they always comment on how clear the water in our spa is. I know it’s because we use SilkBalance!