AquaDoc Spa pH Increaser for Hot Tub - 32oz - Spa pH Up for Water Balance - Hot Tub Chemicals Made in USABrand: MAV AquaDoc Features: Why Hot Tub pH Increaser? Did you know that the water in your spa should be maintained at a pH of 7. 2 to 7. 8 and total alkalinity from 80 to 140 ppm? Using a pH up for hot tub spa will help you maintain your hot tub chemistry effectively. pH Up For Hot Tub Spa Our pH increaser for hot tub will help you maintain your hot tub chemistry balance. If your spa's pH measure is below its range, it is essential to use a hot tub