In the fURL Documentation there is a section that talks about the fURL::removeFromQueryString() function, but the sample code after that is as follows:
// The following code assumes the query string is: example=one&example_2=false
// $new_qs would end up being: example=one
$new_qs = fURL::replaceInQueryString('example_2');
I assume this is supposed to say
// The following code assumes the query string is: example=one&example_2=false
// $new_qs would end up being: example=one
$new_qs = fURL::removeFromQueryString('example_2');