Guardex pH increaser is used to raise pH of spa water. Proper pH control of spa water is essential to eliminate problems caused by pH being too low or too high. If pH is too low then staining and corrosion may occur.
Ideal bathing conditions exist at a slightly alkaline pH level of 7.2 to 7.6 with toal alkalinity of 125/150mg/l (ppm). This range will also allow most effective use of other spa chemicals.
If the reading is below 7.2, then add spa pH increaser at the rate of 11g per 1000 litres of spa water.
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