After more than 10 years of helping people enjoy their hot tub water, SilkBalance has introduced its same scientifically-proven, customer-approved and patented formula in a dissoluble gem. Simply toss and go once a week for crystal, clear water that makes your skin feel soft, balances pH and Alkalinity and neutralizes odors – all while protecting your spa components. No more measuring caps and impossible to spill, SilkBalance Gems dissolve in less than 20 seconds when placed in the filter compartment or jet stream. Easy water care just got even easier!