所有饮用水必须经过过滤。
你需要把饮用水过滤。
通过混凝土桶和塑料桶的处理，生物沙子饮用水过滤系统可以净化95％到99％的细菌、病毒、蠕虫、雨水或者地表水污染颗粒。
Arranged in barrels of concrete or plastic, these biosand water filtration systems (BSFs) remove 95 to 99 percent of the bacteria, viruses, worms and particles contained in rain or surface water.
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