translation.en: And if the water's still not clean enough to drink after it's been through this natural treatment process, the city can treat it again when they pump if back out of the groundwater aquifers before they deliver it to people to drink.
translation.zh: 如果水在经过自然净化处理后， 还是不能直接饮用， 管理人员会把 从地下蓄水层抽出来的水 进行二次处理 然后再供市民饮用。