Welcome to the forum.
Look on the manufacturer's web site.
https://documents.dometic.com/
There should be a manual for the toilet, the vacuum generator, the holding tank and for the macerator.
That site is not terrific, but determination permits locating the required documentation.
The Vacuflush is a good system and can provide long term service when properly maintained.
If the boat is new, the dealership should have provided a bundle of documentation, including stuff for the head. Include asking them in the quest. I like having both printed and electronic documentation.
