Viet Nam

Guess what filtered most of the water you’ve ever sipped – yup, sand!

We have been using sand filters for water purification since ancient times. As water flows through sand, the many, many grains of sand can trap particles through various mechanisms.

Sand filters for household water purification are a simple and inexpensive method that even families in poor countries can afford. Sand is available everywhere.

Contamination of water with arsenic is a major problem in Asia. Studies in Vietnam have shown that simple household sand filters can reduce the amount of arsenic in groundwater by up to 95%.

Sand – nature’s superior water filter!