Patent ID: 8083835

Claim:
A system for purifying indoor air ( 1020 ) comprising: a filter bed ( 820 , 821 ) comprising a growing medium with growing plants ( 1004 ) rooted therein and configured to be capable of sustaining an airflow ( 1021 ) therethrough between a top surface ( 1009 ) thereof and a bottom surface thereof, said filter bed comprising a substantially horizontal portion thereof; an irrigation system ( 201 ) comprising a plurality of irrigation source outlets ( 218 , 600 , 700 ) for delivering water ( 404 , 604 , 703 , 813 , 814 , 1010 ) to said filter bed ( 820 , 821 ) in a substantially-uniform fashion; an active region of said filter bed comprising that region of said filter bed configured so as to substantially have said airflow ( 1021 ) flowing therethrough; and said irrigation system ( 201 ) configured such that water ( 404 , 604 , 703 , 813 , 814 , 1010 ) therefrom is capable of being projected so as to reach at least 50% of said top surface ( 1009 ) of said active region and top down moisturizing said active region; wherein: at least some of said irrigation source outlets ( 218 , 600 , 700 ) are situated below a predominant leaf line ( 1006 ) of said plants ( 1004 ) so as to ensure a projection of water substantially unobstructed by the plant leaves ( 1007 ), at least some of said outlets projecting water ( 404 , 604 , 703 , 813 , 814 , 1010 ) above said top surface ( 1009 ) of said active region; and at least some of said irrigation source outlets ( 218 , 600 , 700 ) are capable of projecting water emanating therefrom over a radius of at least two inches therefrom.