Most AquaPure devices are easy to open. However, in some units, the lid may come off stiffly, especially if it is not screwed on straight or if there is moisture or sand between the lid and the device. It is therefore recommended to open the AquaPure only when it is dry. If you do need to open the lid and it is stuck, try using a fork with a plastic handle. Insert the end of the fork into the smallest opening of a slot in the lid to remove it.