Solvay Bicar Sodium Bicarbonate Alkalinity Up, 50 lbs. 81292

Use when total alk. drops below 80 ppm. Keeps your pH and Chlorine from becoming unstable Granular form, easier to apply into your water Compatible with pool, spa, and hot tub Dosage: 1-1/2 pounds per 10,000 gallons will raise the alk. level by approximately 10 ppm Retest water after every dosage added, you can swim after 4 hours of circulation 50 lb bag.You may also like Haviland HAV3062CS20Q 32 oz Combat 60 Algae Preventative Durachlor, 12 Per Case.