01246 802825 INFO@HOTTUB-REPAIRMEN.CO.UK
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Free Chlorine should be maintained at 3.0mg/l (ppm).
To raise the free chlorine, add by 1mg/l (ppm), add 2g of Granules per 1000 litres (220galls) of spa water.Maintain pH between 7.2 and 7.6.