Hello Saskia,

Thank you for your question.

Unfortunately, only pure water should be filled into the humidifier. We would therefore advise you not to use fragrances, as these can contaminate the product, which could lead to a very unpleasant smell. Of course, we hope that you are still satisfied with your device. :-)

If you have any further questions, please feel free to contact us via social media. We are available for you on Facebook (http://to.philips/6182GCna0) and Twitter (http://to.philips/6183GCnaF).

Best regards
Your Philips Care Team