SpaGuard hot tub balance chemicals protect equipment from damage while balancing water for bather comfort. Use test strips or a test kit to see what your current water pH, alkalinity, and calcium levels are. Use the chemicals in this kit to raise/lower the levels to ensure proper balance in your hot tub. SpaGuard Total Alkalinity Increaser 2lb SpaGuard Calcium Increaser 12oz SpaGuard pH Increaser 18oz SpaGuard pH Decreaser 1lb Floating Scum Absorber The SpaGuard water balancer system - Take the hassle out of hot tub care The correct water balance will protect your spa equipment and help your sanitizer to be more effective A great starter bundle for new hot tub owners. Great for inflatable spas. Bundle does not include sanitizer or test strips - will need to purchase those separately Total Alkalinity Increaser SpaGuard Total Alkalinity Increaser raises the total alkalinity of your hot tub to protect your equipment from corrosion and minimize pH bounce. Low total alkalinity can cause corrosion to your hot tub equipment which can lead to staining and repair bills. Properly balanced total alkalinity also reduces pH bounce. pH Increaser & pH Decreaser SpaGuard pH Increaser and Decreaser raise or lower the pH level in your hot tub to help protect your skin and your equipment. Proper pH balance is critical to make sure sanitizers and shocks work effectively. Calcium Increaser SpaGuard Calcium Hardness Increaser raises the calcium hardness of your hot tub to protect your hot tub against corrosion, extending the life of your equipment and hot tub surfaces Scum Absorber Floating scum absorbers absorbs up to 40 times its weight in residual body oils, suntan oils, grime, slime, and scum to help keep your pool or hot tub clean. Prevents scum build-up on the waterline, cloudy pool or hot tub water, and clogged filters.