Preencha os espaços em branco para completar o texto.
Complete the following sentences about treating fresh water.
In the United Kingdom (UK), rain provides water with low levels of dissolved substances (called water) that collects in the ground and in lakes and rivers.
To make this water potable, it must go through these steps:
- solids sink to the bottom and are removed
- fine particles like sand are removed
sterilising - microbes are