Absorbs 107% its own weight in water before needing recharged! Reactivate repeatedly in an oven, dehumidifier, or even your microwave with no appreciable loss of efficiency. Also ideal for air purification-pore sizes range from 2.6 to 5.0 to remove many undesirable gases. All gases removed are completely recoverable. Desiccant changes color from tan to red when saturated.