Hi @emmanuelkatto24,
I’m hoping to help get other Knacksters engaged in this thread to help. With that being said, would you mind sharing any specifics on what you’re trying to accomplish using private record parameters to filter your data? This could be an example of your public page’s use case and what you’re looking to filter. This may help others guide you. 
In the meantime, if this thread doesn’t get any replies soon, here is a discussion similar to what you asked about that may be useful to you: Public Page Using Private Record Parameters
Additionally, if you haven’t already checked out our developer docs, here is documentation on constructing filters:
Constructing Filters