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SUDS-ONLINE "Grade 1" PH Bundle Pack 1KG PH+ (Plus) and 1.5KG PH- (Minus) Use this high quality PH Minus and PH + to adjust the PH value of the water in your spa (7.2 to 7.6 is the optimum for spas). ,PH Minus is also used to decrease the Total Alkalinity of your Spa,Hot Tub or pool water Ph + is used to increase the Total Alkalinity