All-natural Dri-Pak Soda Crystals are bio-degradable and contain no phosphates, enzymes or bleach. Soda Crystals are an alkaline "washing soda". The main uses of Soda Crystals are to dissolve grease, soften water, loosen dirt and reduce acidity. You can safely combine Soda Crystals with other natural ingredients like baking soda and soap flakes for even more cleaning power. Soda Crystals, along with Soap Flakes, have a long history. They were the primary cleaning products in use at the turn of the twentieth century.