Filtration

Filtration is a simple way to clean liquids or gases. You pass the mixture through something with tiny holes. The liquid goes through, but the solid bits get caught. A coffee filter works this way. So do your kidneys.

Everyday Filtration

Filtration is in many parts of your day. A coffee maker uses a filter to keep grounds out of your drink. A kitchen strainer takes pasta out of hot water. Fish tanks use filters to keep water clean. Even your nose hairs act like a filter for the air you breathe.

Filters That Save Lives

Water filters help make dirty water safe to drink. In some countries, simple sand filters are used. Hospitals use special air filters to stop germs. Face masks also filter out dust and tiny particles. Good filtration keeps people healthy and safe.

Fun Facts

• A paper coffee filter has millions of tiny holes.
• Your kidneys filter all your blood about 25 times every day.
• Some fish, like basking sharks, filter food right out of the water.

Did You Know?

A HEPA filter can catch tiny particles as small as 1/300th the width of a human hair.