桶装纯净水如果密封不好，会直接影响水质。据市城乡供水中心纯净水厂工作人员王伟介绍，不合格的桶盖非常粗糙，没有任何标识，而合格的一次性桶盖上有QS认证标识，桶盖内有密封垫，桶盖上面还有二维码。“QS认证标识的下面需标注食品生产许可证编号，标记模糊或无明显标志的桶装水，市民不要购买。
If the barreled pure water is not sealed properly, it will directly affect the water quality. According to Wang Wei, a staff member of the city's urban and rural water supply center, the unqualified barrel cover is very rough and has no identification, while the qualified one-off barrel cover has QS certification identification, with a sealed cushion inside the barrel cover, and a two-dimensional code on the barrel cover. "Under the QS certification mark, the number of food production license should be marked, and the barreled water with vague or no obvious mark should not be purchased by the public.