code: private function filterElement(ElementInterface $element)
      {
          $value = $element->getValue();
          foreach ($this->filters as $scope => $filter) {
              $elementIds = array_map('trim', explode(',', $scope));
              if ($scope === '*' || in_array($element->getID(), $elementIds)) {
                  $value = $filter->filter($value);
              }
          }
          $element->setValue($value);
      }
docs: Applies all defined filters to an element's value
  
  @param ElementInterface $element