Blueprint’s Soak Cal Up raises the calcium hardness in your hot tub or swim spa. If you don’t maintain calcium levels, your water could become corrosive which could lead to a damaged spa surface, or worse yet, damaged spa equipment. Be sure to use this while your water circulation system is running, or it will not be evenly distributed throughout the water. Additionally, do not pre-dissolve this product, it is designed to be added directly to your hot tub or swim spa’s water.
Raise Calcium Hardness
Prevents Internal & External Damage
Keep Calcium Hardness Between 150 – 200 ppm