1:5:10:365 EcoTip Blog

July 10, 2008

:192 Carbon Water Filtration

Welcome to today’s 1:5:10:365 Tip for becoming a better steward for our home and planet environment.

1:5:10:192 EcoTip: Activated carbon in drinking water filters can help to remove chlorine and other volatile organic compounds. The length of time it takes the water to pass through the filter determines the amount of chemical that gets removed. The slower the water flow the greater the removal.


 Additional Information:

Suggested Review: :190, :191

Be careful when interpreting the quality of a water purifier based on manufacturer’s claims. I was once asked to evaluate a purifier based on test results showing a 99% removal of chlorine. The problem was the manufacturer’s instructions said to install the filter so that it would deliver 1 gallon per minute, but the test was performed with the water being passed through the filter at a rate of 0.1 gallon per minute (ten times slower). The advertised test results were of course much better than what was being delivered to the client’s glass. To get the better results the client needed to slow the rate of filtration down to the test rate.

Chlorine removal performance is easy to test – you can visit any aquarium shop that sells tropical fish and purchase a sensitive chlorine test kit. 

If you want to compare chemical removal efficiency between purifiers before you purchase one, make sure the testing has been performed in compliance with National Sanitation Foundation standards. This will help make sure you are comparing units that have been tested in a consistent way.

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