To prevent the granule from drying out, the filter should always be standing in water, i.e. the base of the water tank should be covered. Ideally store the water tank and filter in a refrigerator.If you don't have space for this, wrap the filter in aluminium foil or a plastic bag and place it in the refrigerator. The filter will then continue to work until after your holiday and will guarantee a perfectly aromatic coffee experience upon your return. After your holiday, change the water and don't forget to thoroughly rinse the water tank and filter. We recommend preparing 1-2 portions of hot water (min. 200 ml) to rinse the filter granule. If you are away for longer than a month, upon your return fit a new filter and rinse the machine before preparing your first coffee.