Home / Chemicals / Pool / Chlorine/Bromine / 50lb bag of Sodium Bicarb (Alkalinity Increaser) View cart “5lb 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 Sale! Box of 12- 1 lb Bags of Turbo Shock $131.99 $86.99 Add to cart Sale! 5lb 1″ Chlorine Tablets $57.99 $54.99 Add to cart Sale! 5lb Turbo Shock $42.99 $36.99 Add to cart Sale! 4.5lb NST Prime (Non Stabilized Tablet) $37.99 $34.99 Add to cart