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1.5 kg. The dose rate is 10g Vian pH Minus per 1,000 litres (220galls) of spa water. Each dose decreases the pH by approx 0.2. After 12 to 24 hours re-check pH level of the water and if it is still above 7.6 repeat the above dose. The ideal pH level is between 7.2 & 7.6. If the level is above 7.6 it should be lowered using pH reducer.
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