Spa Essentials
Spa Essentials 32538000 Total Alkalinity Increaser Granules for Spas and Hot Tubs, 2-Pound
In The Swim
In The Swim Alkalinity Increaser for Spas and Hot Tubs - Raises Alkalinity and Balances pH Levels in Your Spa or Hot Tub Water - 100% Sodium Bicarbonate - 2 Pounds
SplashWiz
ProTeam Spa Alkalinity Increaser for Hot Tub to Keep Alkalinity Up for hot tub spa - with SplashWiz Spa & Hot Tub Chemicals Care Guide e-Book - Made in USA (1lb)
Clorox Pool & Spa
Clorox® Pool&Spa™ Swimming Pool Alkalinity Increaser, Keeps pH Balanced, 16LB (Pack of 2)