Raises the pH Protects corrosion of equipment due to low pH Balances water for bather comfort

Lowers the pH. Protects spa and equipment due to improper pH Prevents cloudy water due to high pH Balances water for bather comfort

Raises the total alkalinity. 1 tbs. per 100 gallons raises total alkalinity 25ppm Eliminates "pH bounce" Helps prevent equipment and spa surface corrosion and damage

Raises calcium levels. 1 tbs. per 100 gallons increases calcium hardness ~25ppm Prevents corrosion of equipment due to low calcium hardness Prevents etching of plaster due to low calcium hardness

Spa Sentry is the easiest way to control pH for clear, stable water. pH is the most critical factor because it changing rapidly when bathers, products or other elements enter the water.