The main purpose of a sand filter is to collect stormwater, rid it of pollutants, and then discharge the water into the storm sewer system. First, water is routed from an impervious surface to the ...

Filtration close filteringThe process of ... is a method for separating an insoluble solid from a liquid. When a mixture of sand and water is filtered: ...

eg by filtration, crystallisation, distillation or chromatography. The method chosen depends upon the type of mixture. A mixture of iron filings and sand can easily be separated using a magnet.

In an effort to safeguard the region’s drinking water from wildfire-related contaminants, the Portland Water Bureau is advancing its filtration capabilities to better prepare for future environmental ...