Home / Chemicals / Pool / Chlorine/Bromine / 50lb bag of Sodium Bisulfate (pH Decreaser) View cart “1lb Bag of NST Purify” has been added to your cart. $69.99 50lb bag of Sodium Bisulfate (pH Decreaser) quantity Add to cart SKU: AAA-8617 Categories: Chemicals, Chlorine Free, Chlorine/Bromine, Clarifiers/Maintenance, Pool Product ID: 2222 Description Description Used to lower the ph/alkalinity in pool water. Chemicals/Pools/Chlorine & Chlorine Free/ Maintenance Related products 5lb 1″ Chlorine Tablets $249.99 Add to cart 1lb Bag of Rapid Shock $7.49 Add to cart Frog Torpedo Pack 6-pack $249.99 Add to cart 5lb Rapid Shock $34.99 Add to cart