It uses rice husks (which are among the country’s most common waste products) to purifywater.
它使用谷物外壳（印度最普通的工业垃圾之一）过滤清水。
2
Socks won't purifywater, but filtering it through fabric can help remove the more visible sediment and creepy- crawlers.
它不能净化水，但可以过滤掉可见沉淀物和可怕的小虫子。
3
The figures for coastal areas and inland wetlands that, among other tasks, help filter and purifywater, were $74, 000 and $14, 000 per hectare per year respectively.