Now, when you look at the water that comes off of your roof and runs off of your lawn and flows down the gutter, you might say to yourself, "Do I really want to drink that stuff?" Well, the answer is you don't want to drink it until it's been treated a little bit.
Al fijarnos en el agua del canalón de lluvia que se esparce por su césped y fluye por el sumidero, uno podría decir: "¿Realmente quiero beber eso?" La respuesta es que no la querrán beber hasta que se haya tratado un poco.