Cookiemonster and extracting query string values in a form

I figured out a way to get a URL query string value to work across multiple pages using the Cookiemonster plugin.

Added the following hook in functions.php and I was able to carry ?slug=ga002 across multiple pages.

add_filter("gform_field_value_slug", "populate_slug");
function populate_slug() {
return $_COOKIE["slug"];
}