1:5:10:365 EcoTip Blog

July 15, 2008

:197 UV Water Purification

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

1:5:10:197 EcoTip: Ultra Violet Light (UV) has some uses for killing bacteria as a part of water purification. Think of it as an alternative to chlorination. Unlike chlorine it has no residual effect.

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 Additional Information:

Suggested Review: :190, :191, :192, :193, :194, :195, :196

UV has been used for helping to achieve low bacteria levels in spas, hot tubs, wells and water purification units. The UV light needs to be shielded so it is concentrated on the water and avoids causing damage to people’s eyes and skin. UV is rendered useless when “shadowing” occurs. In order for it to be effective the bacteria must be exposed to the UV light. Sediment, hardness, minerals, iron, manganese or turbidity will also make the UV system ineffective because the bacteria is shielded from the UV.

This information was paraphrased from the third edition (released in May 2008 ) of Prescriptions for a Healthy House: A Practical Guide for Architects, Builders & Homeowners which I wrote with architect Paula Baker-LaPorte and physician Erica Elliott.

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