Power desiccants are a format of desiccant like silica gel that helps prevent loss of cargo due to over humidity and changing external and internal temperature in shipping containers. These power desiccants help regulate humidity and keeps the container dry from excess moisture and prevents decay of materials. These desiccants keeps the cargo fresh for several days.
But the magic lies in proper proportion and quantity of desiccants you use. It is calculated according to the type and weight of the cargo. The best suited desiccants are either hung in the container or placed in bags at the crates inside the container which helps maintain dryness and reduced moisture and heat.