Hide parameter from URL

kindly
to extend the initial question
which is the technique to be used to keep the URL params not viewable in the URL?

e.g. I need to show and allow to browse a table which is altogether HMTL table in the view showing an entire table of the DB

In my case the URL params would be filters on top of the view table with checkboxes dropdowns radios etc etc
E.G. one column is users name one column is active/inactive (checkbox), one column is nation (drop down where to select the nationality) one column is male/female (radio)
so applying the filters currently, the URL/admin/users/list becomes URL/admin/users/list?page_group1=1&active=0&nation=france&gend=male

so back to the initial question.
Which is the technique to adopt in CodeIgniter to have the parameters "?page_group1=1&active=0&nation=france&gend=male" to be passed as if in the URL but not printed/shown in the URL?
- and possibly, if e.g I click one of the links of the pagination, to be kept set as they are
- and how to manage the change of one of the filters

thank you for any TIP