Eliminate #2 is a liquid, concentrated formula that prevents the precipitation (falling out of solution) of Calcium Scale in hot tub water. Calcium that becomes evident in water can have a scratchy feeling, and a cloudy appearance. Calcium can affix itself to hot tub equipment and fixtures, the Microfilter and the heater coil, inhibiting their performance. Eliminate #2 used as a preventative measure is an effective scale inhibitor. It is designed to use weekly, which will cover make up water through till the next draining sequence.