While people often confuse the two, soda crystals (sodium carbonate) are much stronger than baking soda (sodium bicarbonate). Baking soda is excellent for deodorizing, but it is a mild abrasive and weak alkali. Soda crystals have a higher pH level, which gives them the "bite" necessary to dissolve thick grease and soap scum that baking soda might leave behind. If you have a serious clog, always reach for the soda crystals. When to Use Soda Crystals
If the grease is stubborn, or if you suspect hair might be part of the problem (common in bathroom sinks and showers), you can supercharge the process using a reaction similar to the baking soda and vinegar method. soda crystals unblock drain
Mildly alkaline, safer for skin (though gloves are recommended), and slower acting. Caustic Soda: While people often confuse the two, soda crystals