After installing an adsorber, residual air humidity of approximately 0% RH is achieved. This means that the dew point at the beginning is approx. –40 ° C. With a full load, i.e. a saturation of approx. 33% of the dry silica gel mass, the residual air humidity is approx. 40% RH and thus has a dew point of approx. 6 ° C (depending on the temperature). When using a ventilation dryer, the time of the change is decisive. The sooner the adsorber is exchanged and fresh desiccant is used, the lower the dew point and the lower the amount of water entered. For use on hydraulic units, gearboxes, storage tanks, drums and IBC containers, the change of an adsorber with complete discoloration, i.e. 33% loading, is the right time. Up to this point, the entered amount of water and the dew point have no significant negative impact on the system.