Pool Mate Spa and Hot Tub 2 lb. Alkalinity Increaser (2-Pack)

Pool Mate Spa 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. Pool Mate Spa Alkalinity Up is compatible with chlorine, bromine, ozone and biguanide sanitizers.