Soda crystals have been known since antiquity for their cleaning and degreasing properties on many types of surfaces (laundry, enamel, floors, etc.). Useful for unclogging plumbing, they disinfect, deodorize and are ideal for maintaining toilets and bathrooms. Anhydrous or "concentrated" soda crystals are up to 3 times more effective than conventional or "hydrated" soda crystals.