Since we launched Waterworks, we've had many questions about how to use the system in the best possible way. We dedicated a FAQ-section in our webshop to it, (click) but still have questions coming in by e-mail.
We totally get it: the importance of the air-tight closure and vacuum can easily be underestimated. YES: making sure the top hole of the reservoir is closed air-tight is really THAT important.
Anyway, we hope this little video helps you along. As always: feel free to get in touch if you have any additional questions.
Oh right, i hear you: why we decided on the extra top hole in the first place? We wanted to design something you can enjoy for a long time, the top hole makes it a lot easier to clean the glass reservoirs when they get waterstains.