In The Swim Solvay Bicar Sodium Bicarbonate Alkalinity Up, 50 lbs.

Use when total alk. drops below 80 ppm.Keeps your pH and Chlorine from becoming unstable Granular form, easier to apply into your waterCompatible with pool, spa, and hot tubDosage: 1-1/2 pounds per 10,000 gallons will raise the alk. level by approximately 10 ppmRetest water after every dosage added, you can swim after 4 hours of circulation 50 lb bag.