Filtrovanie obsahu cez URL

Zdravim som zaciatocnik v nette aj v routovani URL adries. Uz dlhsiu dobu sa snazim vytvorit routy pre filtrovanie zobrazovaneho obsahu.
Moja routa napr: www.stranka.sk/cestovanie:

<?php
$filterRoute = array(
	'presenter' => 'List',
	'action' => 'default',
	'filter' => array(
		Route::FILTER_IN => callback($container->dealFilter, 'filterIn'),
		Route::FILTER_OUT => callback($container->dealFilter, 'filterOut'),
	),
);
$frontRouter[] = new Route('[<lang [a-z]{2}>/]<filter>', $filterRoute);
?>

<?php
function filterIn($input) {
	$categoryDao = $this->dealDao->related('categories');
	$category = $categoryDao->findBy(array('slug' => $input));
	$this->setCategories($category);
	$category = current($this->getCategories());
	$url = '';
	if (!empty($category))
		$url =  $category->getSlug();
	else
		$url=  '';
	return $url;
}

function filterOut($input) {
	$category = current($this->getCategories());
	$url = '';
	if (!empty($category))
		$url =  $category->getSlug();
	else
		$url=  '';
	return $url;
}
?>

filter bude napr. nejaka kategoria (neskor bude viac filtrov). V podstate to aj ide len ako zabranit aby sa tam zobrazovali GET parametre pri kliku na signal? Aby v url za <filter> castou uz nic nebolo?