Hot Tub Things pH and Alkalinity Up 2 Pounds - Protects Your Spa From Corrosion Keep hot tub water in check -- this product increases pH and Alkalinity to obtain the proper balance! America's #1 Trusted Brand of Hot Tub Chemicals Safety Tested to Assure Quality, Guaranteed Performance Formulated Exclusively for Hot Tubs And Made from the Purest Chemicals Available Compare to Leisure Time Alkalinity Increaser