Home / Chemicals / Pool / Chlorine/Bromine / 50lb bag of Sodium Bicarb (Alkalinity Increaser) View cart “Box of 12- 1 lb Bags of Rapid Shock –” has been added to your cart. $69.99 50lb bag of Sodium Bicarb (Alkalinity Increaser) quantity Add to cart SKU: AAA-8604 Categories: Chemicals, Chlorine Free, Chlorine/Bromine, Clarifiers/Maintenance, Pool Product ID: 2220 Description Description Used to increase the Alkalinity in Pool Water. Related products Sirona Chlorine/Bromine Spa Test Strips – 25 Count $15.99 Add to cart Sale! 20lb 1″ Chlorine Tablets $189.99 $174.99 Add to cart Sale! 35lb Instant Clear Chlorine Granules $321.99 $281.99 Add to cart Sale! 5lb 1″ Chlorine Tablets $57.99 $54.99 Add to cart