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Biological Filter - The use of vegetation and micro-organisms to remove pollutants from water.
Bonita Creek Virtual Tour
Biological Filter Upper Newport Bay San Diego Creek Bonita Creek meets San Diego Creek University Overpass Bonita Creek Channel Central Bonita Creek Plants Bonita Creek Cottonwood Trees Bonita Creek Water Edge Bison and MacArthur Underpasses Bonita Creek Cactus Bonita Creek Hillside Bonita Reservoir
The Heart of a
Biological Filter

Up close along the water’s edge you see many small roots from the vegetation. Acting as a Biological Filter, these roots pull many of the chemicals out of the water as it heads to San Diego Creek and Upper Newport Bay. Of course, billions of micro-organisms, invisible without a microscope, live in the water and soil to help make it happen.

Check out Activity 3 - Nature's Answer to the Sewage Treatment Plant to learn how to conduct an experiment in biological filtration.

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