To start up a new spa or hot tub, or one recently drained.
Clean all surfaces, backlash or clean the filter, chemically balance the calcium hardness and total alkalinity, treat for metals, if present (iron, copper and manganese), and adjust the ph to 7.2 to 7.6.
Add 7.5 grams (1 1/2 tsp) of this product per 300 gallons of water directly to the spa or hot tub with the circulation system on. Measure bromine residuals after 15 minutes and repeat dosage until an active bromine concentration of 2 to 4 ppm is residential spas is established. The presence of organ debris, high bather use and other factors may require a higher dosage.
Use test strips to monitor for bromine regularly. Do not allay cyanuric acid level to exceed 100 ppm. It is recommended that spa and hot tubs be drained every 30-90 days, more often if under heavy use.