Desiccants are used on a larger scale water loss to remove moisture from the air. We used these as a tool in our balanced drying system in place or along side dehumidifiers on a larger scale project. Desiccants operate differently then dehumidifiers. Desiccants do not collect water through condensation. They vent moisture-laden air from inside the structure to outside the structure using a ventilation system. Desiccants are usually large units and sit outside the structure with venting tubes and air input tubes from and to the structure. They create the greatest vapor pressure and are best used when trying to dry wood flooring, plaster, or concrete. They work on the principle of sorption rather then condensation. Water vapor in this process is adsorbed by a silica gel and then that silica gel is reactivated by energy causing the desiccant to release its moisture to the outside air.