Freshwater™ Vanishing Act Calcium Remover for Hot Tubs and Spas
The Freshwater™ Vanishing Act Calcium Remover bag removes excess calcium hardness from hot tub and spa water. In salt systems, the calcium hardness must be between 25-75ppm. 

Use every time you change your hot tub water.  For use with any water care system, including ACE and Freshwater Salt!

Vanishing Act Bag XL Size: Use the XL Vanishing Act when the calcium hardness level in your fill water is 150ppm or higher.