The general idea behind Sean's 1000 Watt hash bags is nothing new. There's at least a half-dozen companies making similar icewater extraction bags and filter products right now. But for the Denver ...

Richard G. Smith, Timing of Tillage Is an Important Filter on the Assembly of Weed Communities, Weed Science, Vol. 54, No. 4 (Jul. - Aug., 2006), pp. 705-712 ...