public function getFilters($encoded = true) {
        $out = array();
        foreach ($this->_filters as $filterId => $params) {
            $out[] = $filterId.':'.implode(Garp_Browsebox::BROWSEBOX_QUERY_FILTER_PROP_SEPARATOR, $params);
        }
        $out = implode(Garp_Browsebox::BROWSEBOX_QUERY_FILTER_SEPARATOR, $out);
        return base64_encode($out);
    }