Hello Antoon,
Thank you for contacting us. The filter that we recommend is the DGD5005, which I have provided a link to here:
https://www.wahlwater.com/Pentek-DGD-5005-Sediment-Filter-155357-43_p_91.html
I have also reviewed our records and you are due for a change in your UV Lamp. I have linked the UV lamp that you currently have as well.
https://www.wahlwater.com/Absolute-H2O-UV-Lamp-UV-10-IHS-10-WW006_p_290.html
If you have any other questions, please feel free to contact us. Thank you!