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pH minus/reducer is an acid, usually supplied in liquid or granular form, used to lower the pH of pool water when levels are higher than 7.6.
Chlorine works best as a disinfectant when the water is in the pH range 7.2 - 7.4
Relax pH minus is sodium bisulphate, and can be added by sprinkling over the pool inlets or by adding into a skimmer, for rapid mixing with the pool water.