My husband and I LOVE LOVE LOVE SilkBalance for our hot tub! We live in an area where we have extremely hard well water, and this was the only thing we found that helps to easily balance our water levels. Before SilkBalance, we spent hundreds of dollars on chemicals that sales people told us would work. We felt like we were jumping through hoops and we were ready to give the hot tub back!! We got lucky one day when someone at American Sales told us about SilkBalance. We are happy to say goodbye to the chemical regime that we were using! Now we only use SilkBalance and a little bit of chlorine every other day to keep our water crystal clear! So happy!