They should be supplied with a new filter and plug washer and should be changed everytime along with the cap oring. As we knowIf it is completely empty, check the little O rings at the end of the plastic that goes from the cap down the centre of the filter.
![Winking face :wink: ๐](https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f609.png)