How do you raise the alkline level of your pool water?

You can raise the alkaline level if your pool water by adding sodium bicarbonate (aka baking soda). It is recommended that you raise the alkaline in small increments because it is easier to raise your total alkaline levels slightly if its a little too high or too low. This chart from swimming-pool-care.com gives out how much sodium bicarbonate to add.

Desired increase in PPM1,000 gallons5,000 gallons10,000 gallons20,000 gallons50,000 gallons100,000 gallons10 ppm2.24oz11.2oz1.40lbs2.80lbs7.00lbs14.00lbs20 ppm4.48oz1.402.80lbs5.60lbs14.0lbs28lbs30 ppm6.72oz2.10lbs4.20lbs8.41lbs21lbs42lbs40 ppm8.97oz2.80lbs5.60lbs11.2lbs28lbs56lbs50 ppm11.2 oz3.50lbs7lbs14lbs35lbs70lbs60 ppm13.4 oz4.20lbs8.41lbs16.8lbs42lbs84.1lbs