New! Make water care easy! When it’s time to shock your hot tub, SilkBalance Shock Gems are the convenient solution. No measuring required–just toss one or two Shock Gems in your tub after each use to eliminate odors and reduce organic contaminants like cosmetics, perspiration, and body oils. Ideal after each hot tub soak with our virtually chlorine free system. For chlorine system users: Add one or two gems weekly. Take the hassle out of keeping your hot tub clean with this handy, pre-measured, quick-dissolving, non-chlorine shock product!