Spa Choice Spa and Hot Tub 1 lb. Alkalinity Increaser (2-Pack)

Spa Choice Alkalinity Up balances the alkalinity level in your Spa. Maintaining balanced alkalinity is critical to pH control, as low alkalinity levels can cause equipment corrosion, pH bounce and water discoloration. Spa Choice Alkalinity Up is compatible with chlorine, bromine, ozone and biguanide sanitizers.