Duda Energy sc5f Pure Sodium Carbonate Dense Soda Ash Na2CO3 pH Adjust Chemical Spa Pool Cleaning Dishwasher, 5 lb. Industrial Grade Soda ash (Sodium Carbonate) Na2CO3 99.8+% Soda Ash, 0.2% Water May be used for water softening, making glass, regulating pH levels! Excellent base for cleaning up chemical spills, oil absorbent! Works great in homemade laundry detergents and dish washing! Used as a relatively strong base for various settings. May be used in pools to neutralize chlorine