1 kg. It is best to pre-dissolve this product in a clean plastic container, a dose rate of 10g of per 1,000 litres (mix with 2.2galls of warm water), add the resulting solution to the spa whilst the pump is running, preferably near the water inlets to aid distribution. Only dose when bathing has finished. Each dose increases the pH by approx 0.2.After 15 minutes re-check pH level of the water and if it is still less than 7.2 repeat the above dose. The ideal pH level is between 7.2 & 7.6. If the level is less than 7.2 it should be raised using pH increaser.
