protected function _getProductCollection()
    {
        $productCollection = parent::_getProductCollection();
        if(isset($_GET['custom_input'])){
          if(!empty($_GET['custom_input']){
            $customInput = $_GET['custom_input'];
            $productCollection = $this->myModuleHelper->filterProduct(customInput, productCollection);
          }
        }
        $this->_productCollection = $productCollection;
        $this->_productCollection->getSize();
        return $proCollection;
    }