Filters are used to purify water.

过滤器被用来净化水质。

The hydrophytes can purify water body.

水生植被具有净化水体的作用。

The WLPS system can purify water obviously.

利用WLPS系统处理，水质净化效果显著。

I can hunt, I can fish and I can purify water.

我可以打猎，我可以鱼，我可以净化水质。

One of the ways to purify water is to make it spew slowly from the soil.

净化水的方法之一是让它从土中慢慢地渗出。