Hot Tub Things pH Up & Alkalinity Increaser for Hot Tub – Pool Shock, Alkalinity Up, pH Increaser and Alkaline Booster for Spa or Pool, Maintain Balanced Water Quality and Clear Water Use – 2 PoundsBrand: Hot Tub Things Features: WATER BALANCE MADE EASY: Hot Tub Things ph increaser for hot tub raises levels and stabilizes balance, keeping water clear. Works for both an inflatable hot tub or traditional hot tub while also acting as a hot tub ph increaser for simple and consistent care. COMPATIBLE WITH ALL SYSTEMS: Suitable for chlorine, bromine, and mineral purifiers, this alkalinity increaser for swimming pools also functions as a pool ph