pH Plus (Soda Ash Dense) Buckman's Inc packages a variety of water balancing agents in several sizes. If you are a swimming pool retailer, distributor or supplier, you will find these pouches ideal for your residential customers. Our pouched family of pH Plus. (Soda Ash Dense) comes in three sizes: 2 Pound Pouches (12/case) 5 Pound Pouches (8/case)