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Spa alkalinity up is a granular product used to raise the total alkalinity of spa water. Allows you to easily boost your alkalinity levels into the optimal 80 to 140 ppm range. Prevents corrosion damage as well as stabilizing pH. Its quick-dissolving granular formula can be added directly to your spa or hot tub water, eliminating any need for messy dilutions or mixing. Add 1-ounce (2 tablespoons) spa alkalinity up to spa water. Allow water to circulate for 30 minutes. Retest water and repeat steps 1 and 2 until the desired level is reached.