Made in the UK - High Grade Total Alkalinity Increaser / Sodium Bicarbonate Total Alkalinity reading and prevents fluctuations during pH adjustment Alkalinity readings should be maintained between 80 – 150ppm Check the water on a weekly basis with a quality test kit and ensure the Total Alkalinity reading is above 80ppm If the reading is below 80ppm and to raise the Total Alkalinity reading in 10ppm increments, add 30g of Spa Alkalinity Increaser per 1000lts of water and add directly to the water (with circulation running).