Used to raise the water hardness level to help prevent the corrosion of pump and heater parts. pH and free chlorine levels should be tested and adjusted prior to and after using your spa pool. This can be carried out using a simple dip test strip or a tablet or dropper test kit. After the addition of spa chemicals, allow one spa pool turnover (10 minutes of filtration time) to mix in the spa water. Leave the cover off during this time.
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