Filtering runoff saves salmon

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http://snokingwatershedcouncil.org/2014/11/filtering-runoff-saves-salmon/

From the Seattle Times online:

Filtering rain runoff reduces its threat to salmon, study suggests

Stormwater runoff that results from everyday activities — oils from leaky cars, pesticides from lawns and other pollutants — killed fish within four hours in a recent study. The salmon were fine when the same water was filtered through a simple mixture of gravel, sand and compost.

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