AquaDoc Total Alkalinity Increaser for Hot Tub - Alkalinity Booster for Spas & Fresh Water pH BalanceBrand: MAV AquaDoc Features: Need to increase Alkalinity Levels? Use our 2 lbs. container of total Spa Alkalinity Increaser! The alkalinity level of your spa is essential to water balance. A balance in the pH helps prevent damage & corrosion. Raise Alkalinity in Spa: With AquaDoc Alkalinity Booster, balancing your spa water is quick and easy. Whenever the ph levels of your water become unstable, add our product to raise it to the optimal range, with