Using an activated-carbon filtering pitcher significantly reduces chemicals in tap water

Nov 02, 2006

A study conducted by Universite Laval researchers concludes that using an activated-carbon filtering pitcher is the most effective way to reduce disinfection by-products in tap water. The results of the study, funded by the Natural Sciences and Engineering Research Council of Canada, were published in a recent edition of the scientific journal Water Research.

Researchers Steven Lévesque, Christine Beaulieu, Jean Sérodes, François Proulx, and Manuel Rodriguez, from Université Laval's Center for Research in Regional Planning and Development, measured concentrations of the two main drinking water disinfection by-products--trihalomethanes (THMs) and haloacetic acids (HAAs)--in samples subjected to different types of indoor handling. These by-products result from chemical reactions between chlorine used to disinfect water and organic matter normally present in it. "They don't affect the smell or the flavor of water, but in high concentrations they are suspected of increasing the risk of certain types of cancer," points out Rodriguez.

Researchers subjected samples collected in private residences to three treatments often used to improve taste, smell and appearance of water: storing water in the refrigerator, boiling water followed by storage in the refrigerator, and filtering water with an activated-carbon filtering pitcher followed by storage in the refrigerator.

Analysis revealed that after a 48-hour period these treatments reduced THMs by respectively 30%, 87%, and 92%. However, results were less convincing with HAAs: direct storage and storage after boiling had no effect on AHAs. The carbon-activated filter, on the other hand, reduced HAA concentration by 66%.

In spite of these results, Rodriguez does not recommend the systematic use of such filtering pitchers. "If you live in a city with adequate water treatment facilities, HAAs are probably within regulation levels and there's no need to subject water to additional treatment," notes the researcher. "However, if I lived in a place where there were regular notifications to boil water or if I knew the water contained high levels of HAAs, I'd consider using home water-treatment devices," concludes Rodriguez.

Source: Université Laval

Explore further: How myths and tabloids feed on anomalies in science

add to favorites email to friend print save as pdf

Related Stories

Pushing the envelope in power electronics

Aug 12, 2014

U.S. electrical consumption is expected to climb about 1 percent a year through 2030, and the share of electricity that goes through power electronics is expected to climb to 80 percent during the same period. ...

Uncovering secrets of the oceans' "engines"

Jun 30, 2014

They're small, but boy are they mighty. The microbes (or microorganisms) living in our oceans are actually too small to see with the naked eye, but they pack a punch when it comes to their portfolio. Not ...

Recommended for you

How myths and tabloids feed on anomalies in science

1 hour ago

There are many misconceptions about science, including how science advances. One half-truth is that unexpected research findings produce crises, leading to new theories that overturn previous scientific knowledge.

Research band at Karolinska tuck Dylan gems into papers

Sep 29, 2014

(Phys.org) —A 17-year old bet among scientists at the Karolinska Institute has been a wager that whoever wrote the most articles with Dylan quotes before they retired would get a free lunch. Results included ...

A simulation game to help people prep for court

Sep 25, 2014

Preparing for court and appearing before a judge can be a daunting experience, particularly for people who are representing themselves because they can't afford a lawyer or simply don't know all the ropes ...

User comments : 0