This is a video from the Urban Farming Guys who are ready and willing to share their experiences—and here they walk us through how to build a vortex filter which, they say, would cost US$4000 in a store, yet can be made for $100 with a little ingenuity.

Enjoy this video, and if you like it, check out the Wiki, forums, projects and resources on The Urban Farming Guys‘ website for more how to information on cleaner, greener and homegrown food, energy and more.