Desiccant Refills are used to replace the saturated desiccants in the Transformer Breathers. Desiccant Refills are available for all Transformer Breathers, an alternative to the Desiccant Reactivation Unit. When the Envirogel (Orange-Indicating Silica Gel) in the breather shows signs of saturation (colour changing from orange to green), it hints that it is time to replace it with these Desiccant Refills. The Desiccant Refills are available, ranging from 0.5kg to 50kg. Also, investing in the Desiccant Reactivation Unit is an excellent investment to reuse saturated desiccants by drying them out.