Increases hardness in spas and hot tubs in areas with low levels of hardness.
1. Determine amount to be added by using a hardness test kit.
2. Pour proper amount into spa or hot tub with equipment turned on.
3. Run filter for 1-2 hours.
4. Water may be retested in 20 minutes.
1 oz. of LIQUID CALCIUM HARDNESS UP per 700 gallons of water increases hardness by 7 ppm.
Low hardness will etch plaster and corrode equipment.
Chlorine, bromine, ozone and mineral purification systems.