Bricks without straw? Though remanufacturing with discarded PET bottles is highly efficient, material made from discards cannot, after all, get a grade of 100 % in terms of quality.
雖然廢寶特瓶的再製效益極高，但回收物料的品質畢竟無法百分百完美，有時難免會混入雜質或「PE」（聚乙烯，如寶特瓶瓶蓋），甚至「PP」（聚丙烯，如常見的收納盒）、「PC」（聚碳酸酯，如奶瓶）等其他塑料。